diff --git a/tools/stream/tst-build.sh b/tools/stream/tst-build.sh
index 3a5b725c5e484b6747046a14a338c3cbdb1d3be4..a5e207a0b9c0c5c7de6b04440b26602a978f81ca 100755
--- a/tools/stream/tst-build.sh
+++ b/tools/stream/tst-build.sh
@@ -23,16 +23,29 @@ build_tool() {
     nr_node="$(grep "^physical id" /proc/cpuinfo | sort | uniq | wc -l)"
     [ -z "$nr_node" ] && nr_node=2
     [ "$nr_node" -lt 1 ] && nr_node=2
+
     local cache_size_kb
     cache_size_kb="$(cat /sys/devices/system/cpu/cpu0/cache/index*/size | grep -o "[0-9]\+" | sort -n | tail -n 1)"
     [ -z "$cache_size_kb" ] && cache_size_kb=$((32 * 1024))
     [ "$cache_size_kb" -lt $((32 * 1024)) ] && cache_size_kb=$((32 * 1024))
+
     local STREAM_ARRAY_SIZE=$((cache_size_kb * 1024 * 5 * nr_node / 8))
     echo "nr_node=$nr_node, cache_size_kb=$cache_size_kb, STREAM_ARRAY_SIZE=$STREAM_ARRAY_SIZE"
 
+    # 判断3个double数组总大小是否超过2GB，超过则需要 -mcmodel=large
+    # 3 arrays × STREAM_ARRAY_SIZE × 8 bytes > 2GB  =>  STREAM_ARRAY_SIZE > 89478485
+    local mcmodel_flag=""
+    if [ "$STREAM_ARRAY_SIZE" -gt 89478485 ]; then
+        mcmodel_flag="-mcmodel=large"
+        echo "STREAM_ARRAY_SIZE exceeds 2GB limit, add $mcmodel_flag"
+    fi
+
     cp -r "$g_tool_dir" "$g_install_dir/build" || return 1
     cd "$g_install_dir/build" \
         && sed -i "s|STREAM_ARRAY_SIZE=50000000|STREAM_ARRAY_SIZE=${STREAM_ARRAY_SIZE}|g" ./Makefile \
+        && if [ -n "$mcmodel_flag" ]; then
+               sed -i "s|-O3|-O3 ${mcmodel_flag}|g" ./Makefile
+           fi \
         && make -j
 }