diff --git a/src/views/spectrumAnalysis/index.vue b/src/views/spectrumAnalysis/index.vue
index 66bcb00..627b4df 100644
--- a/src/views/spectrumAnalysis/index.vue
+++ b/src/views/spectrumAnalysis/index.vue
@@ -1759,6 +1759,8 @@ export default {
 <style lang="less">
 .spectrum-analysis-operators-dropdown-overlay {
   background-color: #03353f;
+  z-index: 999;
+
   .ant-menu {
     background: transparent;
     padding: 0;