You can sign the contract with a signature pen, pen, ballpoint pen, writing brush, etc.

A contract is an agreement between civil subjects to establish, change and terminate a civil legal relationship. So when signing a contract, you must use an indelible pen to prevent the contents of the contract from being tampered with.

Contracts also have a long history in ancient China. Zhou Li has detailed regulations on the form of early contracts. Judgments, oaths, farewell and contracts are all written forms of ancient contracts. After the Tang, Song, Yuan, Ming and Qing Dynasties, the provisions of contract law became more and more systematic.