diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1722a7cdf690058fe09253fec3d5048788b6ac6..5e63420c0329ff2fd02127a1644a5d51ac723a70 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,18 @@ set_property(CACHE MGE_ARCH PROPERTY STRINGS AUTO
 )
 set (MGE_EXPORT_TARGETS MegEngine-targets)
 
+if(NOT "$ENV{LD_LIBRARY_PATH}" STREQUAL "")
+    string(REPLACE ":" ";" ALTER_LD_LIBRARY_PATHS $ENV{LD_LIBRARY_PATH})
+else()
+    set(ALTER_LD_LIBRARY_PATHS "")
+endif()
+
+if(NOT "$ENV{LIBRARY_PATH}" STREQUAL "")
+    string(REPLACE ":" ";" ALTER_LIBRARY_PATHS $ENV{LIBRARY_PATH})
+else()
+    set(ALTER_LIBRARY_PATHS "")
+endif()
+
 option(MGE_WITH_JIT "Build MegEngine with JIT." ON)
 option(MGE_WITH_JIT_MLIR "Build MegEngine with MLIR JIT." OFF)
 option(MGE_WITH_HALIDE "Build MegEngine with Halide JIT" OFF)
diff --git a/cmake/aclrt.cmake b/cmake/aclrt.cmake
index c25d3e18cf836a1dbce4e8fedddb0b8880aa9da1..d9d3d190b3b8725eb4da336b1ac6d3af3ab416f7 100644
--- a/cmake/aclrt.cmake
+++ b/cmake/aclrt.cmake
@@ -1,11 +1,7 @@
-if($ENV{LIBRARY_PATH})
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 find_library(ACLRT_LIBRARY
     NAMES libascendcl.so
-    PATHS $ENV{LD_LIBRARY_PATH} "$ENV{ACLRT_HOME}/lib64/stub" ${CMAKE_INSTALL_PREFIX}
-    HINTS ${SYSTEM_LIBRARY_PATHS}
+    PATHS ${ALTER_LD_LIBRARY_PATHS} "$ENV{ACLRT_HOME}/lib64/stub" ${CMAKE_INSTALL_PREFIX}
+    HINTS ${ALTER_LIBRARY_PATHS}
     PATH_SUFFIXES stub
     DOC "ACL library." )
 
diff --git a/cmake/cndev.cmake b/cmake/cndev.cmake
index 422912b055910602731f51ca6317d471641b4cba..ae7cdadbc9b5119ddcd9b9f4f7fcba11f4e6021e 100644
--- a/cmake/cndev.cmake
+++ b/cmake/cndev.cmake
@@ -1,11 +1,7 @@
-if($ENV{LIBRARY_PATH})
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 find_library(CNDEV_LIBRARY 
     NAMES libcndev.so
-    PATHS $ENV{LD_LIBRARY_PATH} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
-    HINTS ${SYSTEM_LIBRARY_PATHS}
+    PATHS ${ALTER_LD_LIBRARY_PATHS} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
+    HINTS ${ALTER_LIBRARY_PATHS}
     PATH_SUFFIXES lib lib64
     DOC "CNDEV library." )
 
diff --git a/cmake/cnml.cmake b/cmake/cnml.cmake
index 388f1b76252114e90f7c30ddb009c281e6f215fd..1956129b0ca1cf349216fa119dda6e009ca008fb 100644
--- a/cmake/cnml.cmake
+++ b/cmake/cnml.cmake
@@ -1,11 +1,7 @@
-if($ENV{LIBRARY_PATH})
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 find_library(CNML_LIBRARY 
     NAMES libcnml.so
-    PATHS $ENV{LD_LIBRARY_PATH} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
-    HINTS ${SYSTEM_LIBRARY_PATHS}
+    PATHS ${ALTER_LD_LIBRARY_PATHS} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
+    HINTS ${ALTER_LIBRARY_PATHS}
     PATH_SUFFIXES lib lib64
     DOC "CNML library." )
 
diff --git a/cmake/cnrt.cmake b/cmake/cnrt.cmake
index 4319ef3d2010e5dd1eab85bf3c218bfb61862c4c..fc458d75c48387e26df1103b490370c2475b32f3 100644
--- a/cmake/cnrt.cmake
+++ b/cmake/cnrt.cmake
@@ -1,11 +1,7 @@
-if($ENV{LIBRARY_PATH})
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 find_library(CNRT_LIBRARY 
     NAMES libcnrt.so
-    PATHS $ENV{LD_LIBRARY_PATH} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
-    HINTS ${SYSTEM_LIBRARY_PATHS}
+    PATHS ${ALTER_LD_LIBRARY_PATHS} "$ENV{NEUWARE_HOME}/lib64" ${CMAKE_INSTALL_PREFIX}
+    HINTS ${ALTER_LIBRARY_PATHS}
     PATH_SUFFIXES lib lib64
     DOC "CNRT library." )
 
diff --git a/cmake/cudnn.cmake b/cmake/cudnn.cmake
index 3b037c3cc695612a85f6c5e9b444857b8e94096f..cf18b4a297db9d394b036ca2f89b45da62974739 100644
--- a/cmake/cudnn.cmake
+++ b/cmake/cudnn.cmake
@@ -3,10 +3,6 @@ if(${PkgConfig_FOUND})
     pkg_check_modules(PC_CUDNN QUIET CUDNN)
 endif()
 
-if(NOT "$ENV{LIBRARY_PATH}" STREQUAL "")
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 if("${CUDNN_ROOT_DIR}" STREQUAL "" AND NOT "$ENV{CUDNN_ROOT_DIR}"  STREQUAL "")
     set(CUDNN_ROOT_DIR $ENV{CUDNN_ROOT_DIR})
 endif()
@@ -14,15 +10,15 @@ endif()
 if(MGE_CUDA_USE_STATIC AND NOT MGE_WITH_CUDNN_SHARED)
     find_library(CUDNN_LIBRARY 
         NAMES libcudnn_static.a cudnn.lib
-        PATHS $ENV{LD_LIBRARY_PATH} ${CUDNN_ROOT_DIR} ${PC_CUDNN_LIBRARY_DIRS} ${CMAKE_INSTALL_PREFIX}
-        HINTS ${SYSTEM_LIBRARY_PATHS}
+        PATHS ${ALTER_LD_LIBRARY_PATHS} ${CUDNN_ROOT_DIR} ${PC_CUDNN_LIBRARY_DIRS} ${CMAKE_INSTALL_PREFIX}
+        HINTS ${ALTER_LIBRARY_PATHS}
         PATH_SUFFIXES lib lib64
         DOC "CUDNN library." )
 else()
     find_library(CUDNN_LIBRARY 
         NAMES libcudnn.so libcudnn.dylib cudnn64.dll
-        PATHS $ENV{LD_LIBRARY_PATH} ${CUDNN_ROOT_DIR} ${PC_CUDNN_LIBRARY_DIRS} ${CMAKE_INSTALL_PREFIX}
-        HINTS ${SYSTEM_LIBRARY_PATHS}
+        PATHS ${ALTER_LD_LIBRARY_PATHS} ${CUDNN_ROOT_DIR} ${PC_CUDNN_LIBRARY_DIRS} ${CMAKE_INSTALL_PREFIX}
+        HINTS ${ALTER_LIBRARY_PATHS}
         PATH_SUFFIXES lib lib64
         DOC "CUDNN library." )
 endif()
diff --git a/cmake/tensorrt.cmake b/cmake/tensorrt.cmake
index 1958a643da2b360374f8563a75143e8faef26c90..e5dee682b761f12e38dedae1529fb9807f72981e 100644
--- a/cmake/tensorrt.cmake
+++ b/cmake/tensorrt.cmake
@@ -1,7 +1,3 @@
-if(NOT "$ENV{LIBRARY_PATH}" STREQUAL "")
-    string(REPLACE ":" ";" SYSTEM_LIBRARY_PATHS $ENV{LIBRARY_PATH})
-endif()
-
 if("${TRT_ROOT_DIR}" STREQUAL "" AND NOT "$ENV{TRT_ROOT_DIR}"  STREQUAL "")
     set(TRT_ROOT_DIR $ENV{TRT_ROOT_DIR})
 endif()
@@ -9,15 +5,15 @@ endif()
 if(MGE_CUDA_USE_STATIC)
     find_library(TRT_LIBRARY 
         NAMES libnvinfer_static.a nvinfer.lib
-        PATHS $ENV{LD_LIBRARY_PATH} ${TRT_ROOT_DIR} ${CMAKE_INSTALL_PREFIX}
-        HINTS ${SYSTEM_LIBRARY_PATHS}
+        PATHS ${ALTER_LD_LIBRARY_PATHS} ${TRT_ROOT_DIR} ${CMAKE_INSTALL_PREFIX}
+        HINTS ${ALTER_LIBRARY_PATHS}
         PATH_SUFFIXES lib lib64
         DOC "TRT library." )
 else()
     find_library(TRT_LIBRARY 
         NAMES libnvinfer.so libnvinfer.dylib nvinfer.dll
-        PATHS $ENV{LD_LIBRARY_PATH} ${TRT_ROOT_DIR} ${CMAKE_INSTALL_PREFIX}
-        HINTS ${SYSTEM_LIBRARY_PATHS}
+        PATHS ${ALTER_LD_LIBRARY_PATHS} ${TRT_ROOT_DIR} ${CMAKE_INSTALL_PREFIX}
+        HINTS ${ALTER_LIBRARY_PATHS}
         PATH_SUFFIXES lib lib64
         DOC "TRT library." )
 endif()
diff --git a/scripts/cmake-build/BUILD_README.md b/scripts/cmake-build/BUILD_README.md
index 6e673a9f0436a26f7d2410cbfad9bfd18b28279f..26af6f1470477250a6e63c4fff852bda16358b9d 100755
--- a/scripts/cmake-build/BUILD_README.md
+++ b/scripts/cmake-build/BUILD_README.md
@@ -75,6 +75,10 @@
 2: install gcc/g++, which version >= 6, (gcc/g++ >= 7, if need build training mode)
 3: install build-essential git git-lfs gfortran libgfortran-6-dev autoconf gnupg flex bison gperf curl zlib1g-dev gcc-multilib g++-multilib lib32ncurses5-dev libxml2-utils xsltproc unzip libtool librdmacm-dev rdmacm-utils python3-dev python3-numpy texinfo
 4: CUDA env(if enable CUDA), version detail refer to README.md
+recommend set env about cuda/cudnn/tensorrt as followed:
+export CUDA_ROOT_DIR=/path/to/cuda/lib
+export CUDNN_ROOT_DIR=/path/to/cudnn/lib
+export TRT_ROOT_DIR=/path/to/tensorrt/lib
 ```
 
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