diff --git a/core/build.sh b/core/build.sh
index 0bccf03308..fa19ab5313 100755
--- a/core/build.sh
+++ b/core/build.sh
@@ -12,8 +12,6 @@ RUN_CPPLINT="OFF"
 CUDA_COMPILER=/usr/local/cuda/bin/nvcc
 GPU_VERSION="OFF" #defaults to CPU version
 WITH_MKL="OFF"
-FAISS_ROOT="" #FAISS root path
-FAISS_SOURCE="BUNDLED"
 WITH_PROMETHEUS="ON"
 FIU_ENABLE="OFF"
 BUILD_OPENBLAS="ON"
@@ -29,10 +27,6 @@ while getopts "p:d:t:f:ulrcghzmei" arg; do
   t)
     BUILD_TYPE=$OPTARG # BUILD_TYPE
     ;;
-  f)
-    FAISS_ROOT=$OPTARG
-    FAISS_SOURCE="AUTO"
-    ;;
   u)
     echo "Build and run unittest cases"
     BUILD_UNITTEST="ON"
@@ -71,9 +65,6 @@ parameter:
 -p: install prefix(default: $(pwd)/milvus)
 -d: db data path(default: /tmp/milvus)
 -t: build type(default: Debug)
--f: FAISS root path(default: empty). The path should be an absolute path
-    containing the pre-installed lib/ and include/ directory of FAISS. If they can't be found,
-    we will build the original FAISS from source instead.
 -u: building unit test options(default: OFF)
 -l: run cpplint, clang-format and clang-tidy(default: OFF)
 -r: remove previous build directory(default: OFF)
@@ -86,7 +77,7 @@ parameter:
 -h: help
 
 usage:
-./build.sh -p \${INSTALL_PREFIX} -t \${BUILD_TYPE} -f \${FAISS_ROOT} [-u] [-l] [-r] [-c] [-z] [-g] [-m] [-e] [-h]
+./build.sh -p \${INSTALL_PREFIX} -t \${BUILD_TYPE} [-u] [-l] [-r] [-c] [-z] [-g] [-m] [-e] [-h]
                 "
     exit 0
     ;;
@@ -111,8 +102,6 @@ CMAKE_CMD="cmake \
 -DBUILD_UNIT_TEST=${BUILD_UNITTEST} \
 -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}
 -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
--DFAISS_ROOT=${FAISS_ROOT} \
--DFAISS_SOURCE=${FAISS_SOURCE} \
 -DOpenBLAS_SOURCE=AUTO \
 -DCMAKE_CUDA_COMPILER=${CUDA_COMPILER} \
 -DBUILD_COVERAGE=${BUILD_COVERAGE} \
diff --git a/core/src/index/cmake/FindFAISS.cmake b/core/src/index/cmake/FindFAISS.cmake
deleted file mode 100644
index 3aa5f4e6e4..0000000000
--- a/core/src/index/cmake/FindFAISS.cmake
+++ /dev/null
@@ -1,44 +0,0 @@
-set(FAISS_STATIC_LIB_NAME ${CMAKE_STATIC_LIBRARY_PREFIX}faiss${CMAKE_STATIC_LIBRARY_SUFFIX})
-
-# First, find via if specified FAISS_ROOT
-if (FAISS_ROOT)
-    find_library(FAISS_STATIC_LIB
-            NAMES ${FAISS_STATIC_LIB_NAME}
-            PATHS ${FAISS_ROOT}
-            PATH_SUFFIXES "lib"
-            NO_DEFAULT_PATH
-            )
-    find_path(FAISS_INCLUDE_DIR
-            NAMES "faiss/Index.h"
-            PATHS ${FAISS_ROOT}
-            NO_DEFAULT_PATH
-            PATH_SUFFIXES "include"
-            )
-endif ()
-
-find_package_handle_standard_args(FAISS REQUIRED_VARS FAISS_STATIC_LIB FAISS_INCLUDE_DIR)
-
-if (FAISS_FOUND)
-    if (NOT TARGET faiss)
-        add_library(faiss STATIC IMPORTED)
-
-        set_target_properties(
-                faiss
-                PROPERTIES
-                IMPORTED_LOCATION "${FAISS_STATIC_LIB}"
-                INTERFACE_INCLUDE_DIRECTORIES "${FAISS_INCLUDE_DIR}"
-        )
-
-        if (FAISS_WITH_MKL)
-            set_target_properties(
-                    faiss
-                    PROPERTIES
-                    INTERFACE_LINK_LIBRARIES "${MKL_LIBS}")
-        else ()
-            set_target_properties(
-                    faiss
-                    PROPERTIES
-                    INTERFACE_LINK_LIBRARIES ${OpenBLAS_LIBRARIES})
-        endif ()
-    endif ()
-endif ()