diff --git a/src/ulib/log/log.h b/src/ulib/log/log.h
index f92b6ea..aaf9db0 100644
--- a/src/ulib/log/log.h
+++ b/src/ulib/log/log.h
@@ -6,10 +6,14 @@
 #define ULIB_SRC_LOG_LOG_H_
 
 #include "logger.h"
+#include <fmt/format.h>
 
 namespace tqcq {
 
-#define _ULOG(level, ...)                 ::tqcq::Logger::GetInstance().Log(level, __FILE__, __FUNCTION__, __LINE__, __VA_ARGS__)
+#define _ULOG(level, fmt_str, ...)                                                                                     \
+    tqcq::Logger::GetInstance().Log(level, __FILE__, __FUNCTION__, __LINE__,                                           \
+                                    fmt::format(fmt_str, ##__VA_ARGS__).c_str())
+
 #define ULOG_SET_STRIPPED_PREFIX_LEN(len) ::tqcq::Logger::GetInstance().SetStrippedPrefixLen(len)
 
 #if ULOG_LEVEL <= ULOG_LEVEL_TRACE
diff --git a/src/ulib/log/logger.cpp b/src/ulib/log/logger.cpp
index f1bd221..6812e50 100644
--- a/src/ulib/log/logger.cpp
+++ b/src/ulib/log/logger.cpp
@@ -22,17 +22,16 @@ Logger::Logger() {}
 Logger::~Logger() {}
 
 void
-Logger::Log(int32_t level, const char *file, const char *func, int32_t line, const char *fmt, ...)
+Logger::Log(int32_t level, const char *file, const char *func, int32_t line, const char *msg)
 {
     const char *level_name = Level::ToString(level);
-    char buffer[8192];
-    {
-        va_list args;
-        va_start(args, fmt);
-        vsnprintf(buffer, sizeof(buffer), fmt, args);
-        va_end(args);
+    fmt::print("[{}] {}:{}@{} msg: {}", level_name, file + stripped_prefix_len_, line, func, msg);
+
+    // auto add CR
+    if (msg) {
+        size_t len = strlen(msg);
+        if (len > 0 && msg[len - 1] != '\n') { fmt::print("\n"); }
     }
-    fmt::print("[{}] {}:{}@{} msg: {}", level_name, file + stripped_prefix_len_, line, func, buffer);
 }
 
 void
diff --git a/src/ulib/log/logger.h b/src/ulib/log/logger.h
index 3c18044..11f2857 100644
--- a/src/ulib/log/logger.h
+++ b/src/ulib/log/logger.h
@@ -15,12 +15,13 @@ class Logger {
 public:
     Logger();
     ~Logger();
-    static Logger& GetInstance();
-    void Log(int32_t level, const char* file, const char* func, int32_t line, const char* fmt, ...);
+    static Logger &GetInstance();
+    void Log(int32_t level, const char *file, const char *func, int32_t line, const char *msg);
     void SetStrippedPrefixLen(size_t len);
+
 private:
-    Logger(const Logger&);
-    Logger& operator=(const Logger&);
+    Logger(const Logger &);
+    Logger &operator=(const Logger &);
 
     size_t stripped_prefix_len_;
 };
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5903c99..db0a34a 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -2,7 +2,9 @@ set(CMAKE_CXX_STANDARD 98)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_executable(ulib_test
-        src/ulib/base/types_test.cpp)
+        src/ulib/base/types_test.cpp
+        src/ulib/log/log_test.cpp
+)
 target_link_libraries(ulib_test PRIVATE
         ulib
         gtest
diff --git a/tests/src/ulib/log/log_test.cpp b/tests/src/ulib/log/log_test.cpp
new file mode 100644
index 0000000..f3eb38e
--- /dev/null
+++ b/tests/src/ulib/log/log_test.cpp
@@ -0,0 +1,12 @@
+#include <gtest/gtest.h>
+#include <ulib/log/log.h>
+
+TEST(ULIB_LOG, base_test)
+{
+    ULOG_TRACE("trace log");
+    ULOG_DEBUG("debug log");
+    ULOG_INFO("info log");
+    ULOG_WARN("warn log");
+    ULOG_ERROR("error log");
+    ULOG_FATAL("fatal log");
+}