Legal analysis: the law does not prohibit the use of ballpoint pen signature, as long as it is the result of the true meaning of both parties, what kind of signature does not matter. However, the signature of ballpoint pen has many shortcomings, such as: the words written with ballpoint pen are not kept for a long time, and the handwriting is blurred after a long time. Therefore, it is best to formally sign with a signature pen or carbon ink pen.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.