Problème

See these guides:

Use Touch ID on iPhone and iPad - Apple Support

and/or

If Touch ID isn't working on your iPhone or iPad - Apple Support

If you get no improvements, have your device inspected at an Apple Store or Authorized Service Provider:

Apple – Location Selector

Regards

Giulio

man this guy sees in future :))

what do you mean is not working, you have it set up in settings and is not recognizing your fingers? or you place a finger and does nothing? the last resort could be a hardware issue which you cannot fix.