what if my opponent copy all my move

what should I do?

Check him/her.

just play on. it will impossible after while

Maybe try 1 e4 e5 2 Nf3 Nf6 3 Nc3 Nc6 4 Bb5 Bb4 5 O-O O-O 6 d3 d6 7 Bg5 Bg4 8 Bxf6 Bxf3 9 Qxf3 Qxf6 10 Qxf6 gxf6 11 Nd5. lichess.org/forum/general-chess-discussion/how-to-beat-a-copycat

Remind him of the copyright!

check then move all pieces.