diff --git a/src/time-range/time-range.spec.ts b/src/time-range/time-range.spec.ts
index ce6357a..57d851e 100644
--- a/src/time-range/time-range.spec.ts
+++ b/src/time-range/time-range.spec.ts
@@ -143,6 +143,22 @@ describe('TimeRange Util', () => {
         expect(timeRange.value().length).toEqual(1);
         expect(timeRange.value()[0].interval).toEqual(19.3);
         expect(timeRange.value()[0].end).toEqual(30.2);
+
+        const timeRange2 = new TimeRange([], 5);
+        timeRange2.add({
+          start: 1.11111,
+          end: 11.11111,
+          interval: 9.111111,
+        });
+        timeRange2.add({
+          start: 1.22222,
+          end: 30.22222,
+          interval: 10.22222,
+        });
+        timeRange2.merge(true);
+        expect(timeRange2.value().length).toEqual(1);
+        expect(timeRange2.value()[0].interval).toEqual(19.33333);
+        expect(timeRange2.value()[0].end).toEqual(30.22222);
       });
 
       it('cale decimal points in the totalPlayTime', async () => {
diff --git a/src/time-range/time-range.ts b/src/time-range/time-range.ts
index 0857958..5989e35 100644
--- a/src/time-range/time-range.ts
+++ b/src/time-range/time-range.ts
@@ -30,7 +30,9 @@ export class TimeRange {
           if (prevSection.end >= v.start) {
             prevSection.end = v.end > prevSection.end ? v.end : prevSection.end;
             prevSection.interval = NumberUtil.decimalRoundDown(
-              NumberUtil.decimalRoundUp(prevSection.interval) + NumberUtil.decimalRoundUp(v.interval)
+              NumberUtil.decimalRoundUp(prevSection.interval, this.decimalPlaces) +
+                NumberUtil.decimalRoundUp(v.interval, this.decimalPlaces),
+              this.decimalPlaces
             );
           } else {
             p.push(v);