Dear,

I was shocked to found one INT-1099 though I already finished my e-file(1040A).

In this case, do I need to amend it by filing 1040X?

Thanks!

It is very common mistake. In a hurry to get refund, many taxfilers do this.

Yes, you need to file amended tax return.
If amount is small, you may not file the amended return (your choice) and let IRS send you a tax bill. Since the amount is small, interest and penalty will not be much.