How can i find my iPhone by using IMEI number?

See the following from If Find My iPhone or Find My iPad isn't enabled on your missing device - Apple Support

If your missing device doesn't appear in the Find My app or at iCloud.com/find, you didn't turn on Find My. There's no other Apple service that can find, track, or flag your device for you. But there are steps that you can take to help protect your data.

Andynashy wrote:

How I can find lost iPhone buy using IMEI number??

You can't.