diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b91323..12ae292 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,21 +31,12 @@ if(DEFINED USE_TEST)
     enable_testing()
     add_subdirectory(test)
 endif()
-if(DEFINED USE_BOOST)
-message(STATUS "ofen use boost lib.")
-include_directories(${MBOOST_INCLUDE_DIR})
-link_directories(${MBOOST_LIB_DIR})
-endif()
 
 set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE})
 
 add_library(ofen STATIC ${SRC_FILES})
 target_include_directories(ofen PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include ${CMAKE_CURRENT_SOURCE_DIR}/3rd)
-if(DEFINED USE_BOOST)
-target_link_directories(ofen PRIVATE ${MBOOST_LIB_DIR})
-target_link_libraries(ofen PRIVATE ${MBOOST_LIBS})
-endif()
 if(UNIX)
 execute_process(
     COMMAND uname -a
diff --git a/src/of_path.cpp b/src/of_path.cpp
index 689f2af..f8f7350 100644
--- a/src/of_path.cpp
+++ b/src/of_path.cpp
@@ -1,15 +1,9 @@
 #include "of_path.h"
 #include "of_str.h"
+#include <filesystem>
 #include <fstream>
 #include <regex>
-
-#ifdef USE_BOOST
-#include <boost/filesystem.hpp>
-namespace fs = boost::filesystem;
-#else
-#include <filesystem>
 namespace fs = std::filesystem;
-#endif
 
 #ifdef _WIN32
 #include <windows.h>