diff --git a/src/components/data-analysis/chart-container/CanvasContainer.vue b/src/components/data-analysis/chart-container/CanvasContainer.vue
index c0c0ab9..305ccd8 100644
--- a/src/components/data-analysis/chart-container/CanvasContainer.vue
+++ b/src/components/data-analysis/chart-container/CanvasContainer.vue
@@ -58,8 +58,8 @@
   const numTicks = 5
 
   // Calculate the pixel coordinates of the tick marks on the x and y axes
-  let xTickPixels = getTickPixels(canvasRemainWidth, numTicks)
-  let yTickPixels = getTickPixels(canvasRemainHeight, numTicks)
+  const xTickPixels = getTickPixels(canvasRemainWidth, numTicks)
+  const yTickPixels = getTickPixels(canvasRemainHeight, numTicks)
 
   const generatorColor = function () {
     const red = Math.random() * 255
diff --git a/src/components/data-analysis/file-container/FileContainer.vue b/src/components/data-analysis/file-container/FileContainer.vue
index 56da0f9..ccae810 100644
--- a/src/components/data-analysis/file-container/FileContainer.vue
+++ b/src/components/data-analysis/file-container/FileContainer.vue
@@ -35,7 +35,7 @@
   const selectedFiles = reactive(fileViewStore.selectedFiles)
 
   /* File Modal Handling */
-  let file_modal_ref = ref<InstanceType<typeof FileSlide> | null>(null)
+  const file_modal_ref = ref<InstanceType<typeof FileSlide> | null>(null)
   const showModal = function () {
     file_modal_ref.value?.showModal()
   }
diff --git a/src/pages/admin/data-analysis/DataAnalysis.vue b/src/pages/admin/data-analysis/DataAnalysis.vue
index 5c75b47..dfd5aa8 100644
--- a/src/pages/admin/data-analysis/DataAnalysis.vue
+++ b/src/pages/admin/data-analysis/DataAnalysis.vue
@@ -79,8 +79,8 @@
           chart_ref.value[index]?.appendData(seriesIndex, groupData)
         }
         // draw line
-        let yAxis_list = horizontal.map((x: any) => ({ yAxis: x }))
-        let coord_list = [{ coord: [line[0][0], line[0][1]] }, { coord: [line[1][0], line[1][1]] }]
+        const yAxis_list = horizontal.map((x: any) => ({ yAxis: x }))
+        const coord_list = [{ coord: [line[0][0], line[0][1]] }, { coord: [line[1][0], line[1][1]] }]
         yAxis_list.push(coord_list)
         chart_ref.value[index]?.markLine(yAxis_list)
         chart_ref.value[0].setOption({