How to reply after the invention patent is rejected?

If it is rejected, there is no need to reply, and it is useless to reply.

If you are dissatisfied with the decision to reject the application, you may request a reexamination to the Patent Reexamination Board within three months from the date of receiving the notice of rejection.

Anyone who refuses to accept the reexamination decision of the Patent Reexamination Board may bring a suit in a people's court within three months from the date of receiving the notice.