diff --git a/src/libos/Makefile b/src/libos/Makefile
index 884bc5f5..16309c25 100644
--- a/src/libos/Makefile
+++ b/src/libos/Makefile
@@ -2,8 +2,8 @@ include ../sgxenv.mk
 
 DEBUG=1
 
-LIBOS_ENCLAVE := librusgx.signed.so
-LIBOS_SO := librusgx.so # Link $(LIBOS_A), $(C_OBJS) and all dependencies
+LIBOS_ENCLAVE := libocclum.signed.so
+LIBOS_SO := libocclum.so # Link $(LIBOS_A), $(C_OBJS) and all dependencies
 LIBOS_A := liblibos.a # Built from Rust code
 
 RUST_SRCS := $(wildcard src/*.rs)
diff --git a/src/libos/src/errno.h b/src/libos/src/errno.h
index 47ad6616..8412421f 100644
--- a/src/libos/src/errno.h
+++ b/src/libos/src/errno.h
@@ -1,5 +1,5 @@
-#ifndef __RUSGX_ERRNO_H_
-#define __RUSGX_ERRNO_H_
+#ifndef __OCCLUM_ERRNO_H_
+#define __OCCLUM_ERRNO_H_
 
 /* Copied from glibc headers for x86-64 */
 
@@ -157,4 +157,4 @@
 
 #endif
 
-#endif /* __RUSGX_ERRNO_H_ */
+#endif /* __OCCLUM_ERRNO_H_ */
diff --git a/src/libos/src/lib.rs b/src/libos/src/lib.rs
index df013ae7..60b31647 100644
--- a/src/libos/src/lib.rs
+++ b/src/libos/src/lib.rs
@@ -45,7 +45,7 @@ pub extern "C" fn libos_boot(path_buf: *const i8) -> i32 {
     };
     println!("LibOS boots: {}", path_str);
 
-    let _ = backtrace::enable_backtrace("librusgx.signed.so", PrintFormat::Short);
+    let _ = backtrace::enable_backtrace("libocclum.signed.so", PrintFormat::Short);
     panic::catch_unwind(||{
         backtrace::__rust_begin_short_backtrace(||{
             process::do_spawn(&path_str);
@@ -57,7 +57,7 @@ pub extern "C" fn libos_boot(path_buf: *const i8) -> i32 {
 
 #[no_mangle]
 pub extern "C" fn libos_run() -> i32 {
-    let _ = backtrace::enable_backtrace("librusgx.signed.so", PrintFormat::Short);
+    let _ = backtrace::enable_backtrace("libocclum.signed.so", PrintFormat::Short);
     panic::catch_unwind(||{
         backtrace::__rust_begin_short_backtrace(||{
             let _ = process::run_task();
diff --git a/src/libos/src/process.rs b/src/libos/src/process.rs
index e9f2fb2c..cabd01eb 100644
--- a/src/libos/src/process.rs
+++ b/src/libos/src/process.rs
@@ -276,7 +276,7 @@ impl Process {
     fn link_syscalls(self: &mut Process, elf_file: &ElfFile)
         -> Result<(), Error>
     {
-        let syscall_addr = rusgx_syscall as *const () as usize;
+        let syscall_addr = __occlum_syscall as *const () as usize;
 
         let rela_entries = elf_helper::get_pltrel_entries(&elf_file)?;
         let dynsym_entries = elf_helper::get_dynsym_entries(&elf_file)?;
@@ -287,7 +287,7 @@ impl Process {
                 .map_err(|e| Error::new(Errno::ENOEXEC,
                                         "Failed to get the name of dynamic symbol"))?;
 
-            if dynsym_str == "rusgx_syscall" {
+            if dynsym_str == "__occlum_syscall" {
                 let rela_addr = self.program_base_addr + rela_entry.get_offset() as usize;
                 unsafe {
                     std::ptr::write_unaligned(rela_addr as *mut usize, syscall_addr);
@@ -356,5 +356,5 @@ extern {
     fn ocall_run_new_task(ret: *mut i32) -> sgx_status_t;
     fn do_run_task(task: *const Task) -> i32;
     fn do_exit_task();
-    fn rusgx_syscall(num: i32, arg0: u64, arg1: u64, arg2: u64, arg3: u64, arg4: u64) -> i64;
+    fn __occlum_syscall(num: i32, arg0: u64, arg1: u64, arg2: u64, arg3: u64, arg4: u64) -> i64;
 }
diff --git a/src/libos/src/syscall.h b/src/libos/src/syscall.h
index d040b719..ff0820dc 100644
--- a/src/libos/src/syscall.h
+++ b/src/libos/src/syscall.h
@@ -1,5 +1,5 @@
-#ifndef __RUSGX_SYSCALL_H__
-#define __RUSGX_SYSCALL_H__
+#ifndef __OCCLUM_SYSCALL_H__
+#define __OCCLUM_SYSCALL_H__
 
 #include <sys/types.h>
 #include "syscall_nr.h"
@@ -8,19 +8,19 @@
 extern "C" {
 #endif
 
-extern int rusgx_open(const char* path, int flags, int mode);
-extern int rusgx_close(int fd);
-extern ssize_t rusgx_read(int fd, void* buf, size_t size);
-extern ssize_t rusgx_write(int fd, const void* buf, size_t size);
-extern int rusgx_spawn(int* child_pid, const char* path,
+extern int occlum_open(const char* path, int flags, int mode);
+extern int occlum_close(int fd);
+extern ssize_t occlum_read(int fd, void* buf, size_t size);
+extern ssize_t occlum_write(int fd, const void* buf, size_t size);
+extern int occlum_spawn(int* child_pid, const char* path,
                         const char** argv,
                         const char** envp);
-extern int rusgx_wait4(int child_pid, int* status, int options/*, struct rusage* rusage*/);
-extern unsigned int rusgx_getpid(void);
-extern void rusgx_exit(int status);
+extern int occlum_wait4(int child_pid, int* status, int options/*, struct rusage* rusage*/);
+extern unsigned int occlum_getpid(void);
+extern void occlum_exit(int status);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* __RUSGX_SYSCALL_H__ */
+#endif /* __OCCLUM_SYSCALL_H__ */
diff --git a/src/libos/src/syscall.rs b/src/libos/src/syscall.rs
index 08c0dbb6..db5cbb6b 100644
--- a/src/libos/src/syscall.rs
+++ b/src/libos/src/syscall.rs
@@ -11,7 +11,7 @@ use std::ffi::CStr; // a borrowed C string
 
 */
 #[no_mangle]
-pub extern "C" fn rusgx_open(path_buf: * const c_char, flags: c_int, mode: c_int) -> c_int {
+pub extern "C" fn occlum_open(path_buf: * const c_char, flags: c_int, mode: c_int) -> c_int {
     let path = unsafe {
         CStr::from_ptr(path_buf as * const i8).to_string_lossy().into_owned()
     };
@@ -26,7 +26,7 @@ pub extern "C" fn rusgx_open(path_buf: * const c_char, flags: c_int, mode: c_int
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_close(fd: c_int) -> c_int {
+pub extern "C" fn occlum_close(fd: c_int) -> c_int {
     match fs::do_close(fd as file_table::FileDesc) {
         Ok(()) => {
             0
@@ -38,7 +38,7 @@ pub extern "C" fn rusgx_close(fd: c_int) -> c_int {
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_read(fd: c_int, buf: * mut c_void, size: size_t) -> ssize_t {
+pub extern "C" fn occlum_read(fd: c_int, buf: * mut c_void, size: size_t) -> ssize_t {
     let buf = unsafe {
         std::slice::from_raw_parts_mut(buf as *mut u8, size as usize)
     };
@@ -53,11 +53,11 @@ pub extern "C" fn rusgx_read(fd: c_int, buf: * mut c_void, size: size_t) -> ssiz
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_write(fd: c_int, buf: * const c_void, size: size_t) -> ssize_t {
+pub extern "C" fn occlum_write(fd: c_int, buf: * const c_void, size: size_t) -> ssize_t {
 /*    let str_from_c = unsafe {
         CStr::from_ptr(buf as * const i8).to_string_lossy().into_owned()
     };
-    println!("rusgx_write: {}", str_from_c);
+    println!("occlum_write: {}", str_from_c);
     size as ssize_t
 */
     let buf = unsafe {
@@ -74,19 +74,19 @@ pub extern "C" fn rusgx_write(fd: c_int, buf: * const c_void, size: size_t) -> s
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_getpid() -> c_uint
+pub extern "C" fn occlum_getpid() -> c_uint
 {
     process::do_getpid()
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_exit(status: i32)
+pub extern "C" fn occlum_exit(status: i32)
 {
     process::do_exit(status);
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_spawn(child_pid: *mut c_int, path: *const c_char,
+pub extern "C" fn occlum_spawn(child_pid: *mut c_int, path: *const c_char,
     argv: *const *const c_char, envp: *const *const c_char) -> c_int
 {
     let mut ret = 0;
@@ -105,7 +105,7 @@ pub extern "C" fn rusgx_spawn(child_pid: *mut c_int, path: *const c_char,
 }
 
 #[no_mangle]
-pub extern "C" fn rusgx_wait4(child_pid: c_int, _exit_code: *mut c_int,
+pub extern "C" fn occlum_wait4(child_pid: c_int, _exit_code: *mut c_int,
     options: c_int/*, rusage: *mut Rusage*/) -> c_int
 {
     match process::do_wait4(child_pid as u32) {
diff --git a/src/libos/src/syscall_entry.c b/src/libos/src/syscall_entry.c
index c975dcb7..96dab001 100644
--- a/src/libos/src/syscall_entry.c
+++ b/src/libos/src/syscall_entry.c
@@ -10,7 +10,7 @@ long dispatch_syscall(int num, long arg0, long arg1, long arg2, long arg3, long
     switch (num) {
     case SYS_exit: {
         DECL_SYSCALL_ARG(int, status, arg0);
-        rusgx_exit(status);
+        occlum_exit(status);
         do_exit_task();
         break;
     }
@@ -18,26 +18,26 @@ long dispatch_syscall(int num, long arg0, long arg1, long arg2, long arg3, long
         DECL_SYSCALL_ARG(const void*, path, arg0);
         DECL_SYSCALL_ARG(int, flags, arg1);
         DECL_SYSCALL_ARG(int, mode, arg2);
-        ret = rusgx_open(path, flags, mode);
+        ret = occlum_open(path, flags, mode);
         break;
     }
     case SYS_close: {
         DECL_SYSCALL_ARG(int, fd, arg0);
-        ret = rusgx_close(fd);
+        ret = occlum_close(fd);
         break;
     }
     case SYS_write: {
         DECL_SYSCALL_ARG(int, fd, arg0);
         DECL_SYSCALL_ARG(const void*, buf, arg1);
         DECL_SYSCALL_ARG(size_t, buf_size, arg2);
-        ret = rusgx_write(fd, buf, buf_size);
+        ret = occlum_write(fd, buf, buf_size);
         break;
     }
     case SYS_read: {
         DECL_SYSCALL_ARG(int, fd, arg0);
         DECL_SYSCALL_ARG(void*, buf, arg1);
         DECL_SYSCALL_ARG(size_t, buf_size, arg2);
-        ret = rusgx_read(fd, buf, buf_size);
+        ret = occlum_read(fd, buf, buf_size);
         break;
     }
     case SYS_spawn: {
@@ -45,7 +45,7 @@ long dispatch_syscall(int num, long arg0, long arg1, long arg2, long arg3, long
         DECL_SYSCALL_ARG(const char*, path, arg1);
         DECL_SYSCALL_ARG(const char**, argv, arg2);
         DECL_SYSCALL_ARG(const char**, envp, arg3);
-        ret = rusgx_spawn(child_pid, path, argv, envp);
+        ret = occlum_spawn(child_pid, path, argv, envp);
         break;
     }
     case SYS_wait4: {
@@ -53,11 +53,11 @@ long dispatch_syscall(int num, long arg0, long arg1, long arg2, long arg3, long
         DECL_SYSCALL_ARG(int*, status, arg1);
         DECL_SYSCALL_ARG(int, options, arg2);
         //DECL_SYSCALL_ARG(struct rusage*, rusage, arg3);
-        ret = rusgx_wait4(child_pid, status, options/*, rusage*/);
+        ret = occlum_wait4(child_pid, status, options/*, rusage*/);
         break;
     }
     case SYS_getpid: {
-        ret = rusgx_getpid();
+        ret = occlum_getpid();
         break;
     }
     default:
diff --git a/src/libos/src/syscall_entry_x86-64.S b/src/libos/src/syscall_entry_x86-64.S
index be1c3e5a..4b5c5665 100644
--- a/src/libos/src/syscall_entry_x86-64.S
+++ b/src/libos/src/syscall_entry_x86-64.S
@@ -2,9 +2,9 @@
 #include "task.h"
 
     .file "syscall_entry_x86-64.S"
-    .global rusgx_syscall
-    .type rusgx_syscall, @function
-rusgx_syscall:
+    .global __occlum_syscall
+    .type __occlum_syscall, @function
+__occlum_syscall:
     push %rbp
     movq %rsp, %rbp
 
diff --git a/src/libos/src/syscall_nr.h b/src/libos/src/syscall_nr.h
index a94ea311..07f734b9 100644
--- a/src/libos/src/syscall_nr.h
+++ b/src/libos/src/syscall_nr.h
@@ -1,5 +1,5 @@
-#ifndef __RUSGX_SYSCALL_NR_H__
-#define __RUSGX_SYSCALL_NR_H__
+#ifndef __OCCLUM_SYSCALL_NR_H__
+#define __OCCLUM_SYSCALL_NR_H__
 
 /* Macros are copied from glibc headers for x86-64 */
 
@@ -713,4 +713,4 @@
 
 #define __NR_spawn 360
 
-#endif /* __RUSGX_SYSCALL_NR_H__ */
+#endif /* __OCCLUM_SYSCALL_NR_H__ */
diff --git a/src/libos/src/task.c b/src/libos/src/task.c
index ccf751cc..d3e00e13 100644
--- a/src/libos/src/task.c
+++ b/src/libos/src/task.c
@@ -33,7 +33,7 @@ int do_run_task(struct Task* task) {
         __run_task(task->user_entry_addr, task->user_stack_addr);
     }
 
-    // From rusgx_exit
+    // From occlum_exit
     RESET_CURRENT_TASK();
     return 0;
 }
diff --git a/src/libos/src/task.h b/src/libos/src/task.h
index c7693b26..833df503 100644
--- a/src/libos/src/task.h
+++ b/src/libos/src/task.h
@@ -1,5 +1,5 @@
-#ifndef __RUSGX_TASK_H__
-#define __RUSGX_TASK_H__
+#ifndef __OCCLUM_TASK_H__
+#define __OCCLUM_TASK_H__
 
 #ifndef __ASSEMBLY__
 
@@ -41,4 +41,4 @@ void do_exit_task(void);
 
 #endif /* __ASSEMBLY__ */
 
-#endif /* __RUSGX_TASK_H__ */
+#endif /* __OCCLUM_TASK_H__ */
diff --git a/src/pal/pal.c b/src/pal/pal.c
index f7f60192..d11d5d8e 100644
--- a/src/pal/pal.c
+++ b/src/pal/pal.c
@@ -214,7 +214,7 @@ int SGX_CDECL main(int argc, char *argv[])
     }
     const char* executable_path = argv[1];
 
-    const char* enclave_path = "librusgx.signed.so";
+    const char* enclave_path = "libocclum.signed.so";
     /* Initialize the enclave */
     if(initialize_enclave(enclave_path) < 0){
         printf("Enter a character before exit ...\n");
diff --git a/test/Makefile b/test/Makefile
index 27b57e13..a16384a2 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -31,10 +31,10 @@ run: build $(RUN_TEST_SUITES)
 pal: $(PROJECT_DIR)/src/pal/pal
 	cp $< pal
 
-librusgx.signed.so: $(PROJECT_DIR)/src/libos/librusgx.signed.so
-	cp $< librusgx.signed.so
+libocclum.signed.so: $(PROJECT_DIR)/src/libos/libocclum.signed.so
+	cp $< libocclum.signed.so
 
-$(RUN_TEST_SUITES): run-%: % pal librusgx.signed.so
+$(RUN_TEST_SUITES): run-%: % pal libocclum.signed.so
 	@$(MAKE) -C $< run
 
 #############################################################################
@@ -43,7 +43,7 @@ $(RUN_TEST_SUITES): run-%: % pal librusgx.signed.so
 
 clean: $(CLEAN_TEST_SUITES)
 	@$(MAKE) -C rusgx_stub clean
-	@$(RM) -f pal librusgx.signed.so
+	@$(RM) -f pal libocclum.signed.so
 
 $(CLEAN_TEST_SUITES): clean-%:
 	@$(MAKE) -C $(patsubst clean-%,%,$@) clean
diff --git a/test/include/rusgx_stub.h b/test/include/rusgx_stub.h
index 33ee7680..e925c600 100644
--- a/test/include/rusgx_stub.h
+++ b/test/include/rusgx_stub.h
@@ -46,20 +46,20 @@
 #define O_SYNC          0x00101000U
 
 
-long rusgx_syscall(int num, long arg0, long arg1, long arg2, long arg3, long arg4);
+long __occlum_syscall(int num, long arg0, long arg1, long arg2, long arg3, long arg4);
 
 #define RUSGX_SYSCALL0(num) \
-    rusgx_syscall((num), (long)0, (long)0, (long)0, (long)0, (long)0)
+    __occlum_syscall((num), (long)0, (long)0, (long)0, (long)0, (long)0)
 #define RUSGX_SYSCALL1(num, arg0) \
-    rusgx_syscall((num), (long)(arg0), (long)0, (long)0, (long)0, (long)0)
+    __occlum_syscall((num), (long)(arg0), (long)0, (long)0, (long)0, (long)0)
 #define RUSGX_SYSCALL2(num, arg0, arg1) \
-    rusgx_syscall((num), (long)(arg0), (long)(arg1), (long)0, (long)0, (long)0)
+    __occlum_syscall((num), (long)(arg0), (long)(arg1), (long)0, (long)0, (long)0)
 #define RUSGX_SYSCALL3(num, arg0, arg1, arg2) \
-    rusgx_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)0, (long)0)
+    __occlum_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)0, (long)0)
 #define RUSGX_SYSCALL4(num, arg0, arg1, arg2, arg3) \
-    rusgx_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)(arg3), (long)0)
+    __occlum_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)(arg3), (long)0)
 #define RUSGX_SYSCALL5(num, arg0, arg1, arg2, arg3, arg4) \
-    rusgx_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)(arg3), (long)(arg4))
+    __occlum_syscall((num), (long)(arg0), (long)(arg1), (long)(arg2), (long)(arg3), (long)(arg4))
 
 
 static inline ssize_t __rusgx_read(int fd, void* buf, unsigned long size) {
diff --git a/test/rusgx_stub/stub_impl.c b/test/rusgx_stub/stub_impl.c
index 4d764aac..47899d0d 100644
--- a/test/rusgx_stub/stub_impl.c
+++ b/test/rusgx_stub/stub_impl.c
@@ -52,7 +52,7 @@ static void __exit(int status) {
     return;
 }
 
-long rusgx_syscall(int num, long arg0, long arg1, long arg2, long arg3, long arg4) {
+long __occlum_syscall(int num, long arg0, long arg1, long arg2, long arg3, long arg4) {
     long ret = 0;
     switch (num) {
     case SYS_exit: