diff --git a/src/kernel/arch/aarch64/include/cpu.hpp b/src/kernel/arch/aarch64/include/cpu.hpp
index c48d5ce38..73b6dbbcb 100644
--- a/src/kernel/arch/aarch64/include/cpu.hpp
+++ b/src/kernel/arch/aarch64/include/cpu.hpp
@@ -148,7 +148,7 @@ class ReadWriteRegBase : public ReadOnlyRegBase<RegInfo>,
 // 第三部分：寄存器实例
 class X29 : public ReadWriteRegBase<reginfo::X29Info> {
  public:
-  friend std::ostream &operator<<(std::ostream &os, const X29 &x29) {
+  friend sk_std::ostream &operator<<(sk_std::ostream &os, const X29 &x29) {
     printf("val: 0x%p", (void *)x29.Read());
     return os;
   }
diff --git a/src/kernel/arch/riscv64/arch_main.cpp b/src/kernel/arch/riscv64/arch_main.cpp
index a53d751c5..1fe288c14 100644
--- a/src/kernel/arch/riscv64/arch_main.cpp
+++ b/src/kernel/arch/riscv64/arch_main.cpp
@@ -58,7 +58,7 @@ uint32_t ArchInit(uint32_t argc, uint8_t *argv) {
   kKernelFdt.GetInstance() = KernelFdt((uint64_t)argv);
 
   kBasicInfo.GetInstance() = BasicInfo(argc, argv);
-  std::cout << kBasicInfo.GetInstance();
+  sk_std::cout << kBasicInfo.GetInstance();
 
   auto [serial_base, serial_size] = kKernelFdt.GetInstance().GetSerial();
   auto uart = Ns16550a(serial_base);
diff --git a/src/kernel/arch/riscv64/include/cpu.hpp b/src/kernel/arch/riscv64/include/cpu.hpp
index e92b0313a..aef672c97 100644
--- a/src/kernel/arch/riscv64/include/cpu.hpp
+++ b/src/kernel/arch/riscv64/include/cpu.hpp
@@ -1149,7 +1149,7 @@ class ReadWriteField : public ReadOnlyField<Reg, RegInfo>,
 // 第三部分：寄存器实例
 class Fp : public ReadWriteRegBase<reginfo::FpInfo> {
  public:
-  friend std::ostream &operator<<(std::ostream &os, const Fp &fp) {
+  friend sk_std::ostream &operator<<(sk_std::ostream &os, const Fp &fp) {
     printf("val: 0x%p", (void *)fp.Read());
     return os;
   }
diff --git a/src/kernel/arch/x86_64/arch_main.cpp b/src/kernel/arch/x86_64/arch_main.cpp
index 27fdbafc9..8ceee3d6a 100644
--- a/src/kernel/arch/x86_64/arch_main.cpp
+++ b/src/kernel/arch/x86_64/arch_main.cpp
@@ -98,7 +98,7 @@ uint32_t ArchInit(uint32_t argc, uint8_t *argv) {
   }
 
   kBasicInfo.GetInstance() = BasicInfo(argc, argv);
-  std::cout << kBasicInfo.GetInstance();
+  sk_std::cout << kBasicInfo.GetInstance();
 
   // 解析内核 elf 信息
   kKernelElf.GetInstance() = KernelElf(kBasicInfo.GetInstance().elf_addr,
diff --git a/src/kernel/arch/x86_64/include/cpu.hpp b/src/kernel/arch/x86_64/include/cpu.hpp
index 086206868..630f510dc 100644
--- a/src/kernel/arch/x86_64/include/cpu.hpp
+++ b/src/kernel/arch/x86_64/include/cpu.hpp
@@ -1670,7 +1670,7 @@ class ReadWriteField : public ReadOnlyField<Reg, RegInfo>,
 // 第三部分：寄存器实例
 class Rbp : public ReadWriteRegBase<reginfo::RbpInfo> {
  public:
-  friend std::ostream &operator<<(std::ostream &os, const Rbp &rbp) {
+  friend sk_std::ostream &operator<<(sk_std::ostream &os, const Rbp &rbp) {
     printf("val: 0x%p", (void *)rbp.Read());
     return os;
   }
diff --git a/src/kernel/include/basic_info.hpp b/src/kernel/include/basic_info.hpp
index 27badcbeb..97bee5945 100644
--- a/src/kernel/include/basic_info.hpp
+++ b/src/kernel/include/basic_info.hpp
@@ -60,8 +60,8 @@ struct BasicInfo {
   ~BasicInfo() = default;
   /// @}
 
-  friend std::ostream &operator<<(std::ostream &os,
-                                  const BasicInfo &basic_info) {
+  friend sk_std::ostream &operator<<(sk_std::ostream &os,
+                                     const BasicInfo &basic_info) {
     printf("physical_memory_addr: 0x%X, size 0x%X.\n",
            basic_info.physical_memory_addr, basic_info.physical_memory_size);
     printf("kernel_addr: 0x%X, size 0x%X.\n", basic_info.kernel_addr,
diff --git a/src/kernel/include/kernel_log.hpp b/src/kernel/include/kernel_log.hpp
index beb76bc8f..8f66a619b 100644
--- a/src/kernel/include/kernel_log.hpp
+++ b/src/kernel/include/kernel_log.hpp
@@ -36,7 +36,7 @@ static constexpr const auto kCyan = "\033[36m";
 static constexpr const auto kWhite = "\033[37m";
 
 template <void (*OutputFunction)(const char* format, ...)>
-class Logger : public std::ostream {
+class Logger : public sk_std::ostream {
  public:
   Logger& operator<<(int8_t val) override {
     OutputFunction("%d", val);
diff --git a/src/kernel/libcxx/include/cstring b/src/kernel/libcxx/include/cstring
index 0a371aa32..e032d692b 100644
--- a/src/kernel/libcxx/include/cstring
+++ b/src/kernel/libcxx/include/cstring
@@ -19,7 +19,7 @@
 
 #include "string.h"
 
-namespace std {
+namespace sk_std {
 
 using ::memcmp;
 using ::memcpy;
@@ -34,6 +34,6 @@ using ::strncmp;
 using ::strncpy;
 using ::strnlen;
 
-};  // namespace std
+};  // namespace sk_std
 
 #endif /* SIMPLEKERNEL_SRC_KERNEL_LIBCXX_INCLUDE_CSTRING_ */
diff --git a/src/kernel/libcxx/include/iostream b/src/kernel/libcxx/include/iostream
index c8c87fc15..98177dbc3 100644
--- a/src/kernel/libcxx/include/iostream
+++ b/src/kernel/libcxx/include/iostream
@@ -20,7 +20,7 @@
 
 #include <cstdint>
 
-namespace std {
+namespace sk_std {
 class ostream {
  public:
   enum openmode : uint8_t {
@@ -57,6 +57,6 @@ inline ostream& endl(ostream& os) { return os << "\n"; }
 
 [[maybe_unused]] static ostream cout;
 
-};  // namespace std
+};  // namespace sk_std
 
 #endif /* SIMPLEKERNEL_SRC_KERNEL_LIBCXX_INCLUDE_IOSTREAM_ */
diff --git a/src/kernel/libcxx/iostream.cpp b/src/kernel/libcxx/iostream.cpp
index 50f051d7c..755d3030d 100644
--- a/src/kernel/libcxx/iostream.cpp
+++ b/src/kernel/libcxx/iostream.cpp
@@ -21,7 +21,7 @@
 
 #include "cstdio"
 
-namespace std {
+namespace sk_std {
 
 ostream& ostream::operator<<(int8_t val) {
   printf("%d", val);
@@ -72,4 +72,4 @@ ostream& ostream::operator<<(ostream& (*manip)(ostream&)) {
   return manip(*this);
 }
 
-};  // namespace std
+};  // namespace sk_std
diff --git a/src/kernel/main.cpp b/src/kernel/main.cpp
index 03e6f8e6f..b08e33dee 100644
--- a/src/kernel/main.cpp
+++ b/src/kernel/main.cpp
@@ -49,7 +49,7 @@ uint32_t main(uint32_t argc, uint8_t *argv) {
 
   DumpStack();
 
-  std::cout << "Hello ostream" << std::endl;
+  sk_std::cout << "Hello ostream" << sk_std::endl;
 
   InterruptInit(argc, argv);
 
diff --git a/test/system_test/cxx_init_test/main.cpp b/test/system_test/cxx_init_test/main.cpp
index 34e46efd0..6c3143f15 100644
--- a/test/system_test/cxx_init_test/main.cpp
+++ b/test/system_test/cxx_init_test/main.cpp
@@ -30,6 +30,8 @@ extern "C" void _putchar(char character) { serial.Write(character); }
 extern "C" void _putchar(char character) {
   sbi_debug_console_write_byte(character);
 }
+#elif __aarch64__
+extern "C" void _putchar(char character) { (void)character; }
 #endif
 
 template <uint32_t V>