Have legal effect. The law does not stipulate what kind of signature to use, as long as it is my signature and the handwriting is clear, it is valid.

This contract is written in blue ballpoint pen and is valid only if the following conditions are met:

1, the actor has corresponding capacity for civil conduct;

2. The meaning is true;

3, do not violate the mandatory provisions of laws and administrative regulations, do not violate public order and good customs.

The law does not prohibit signing with ballpoint pens; As long as it is the result of the true meaning of both parties, it doesn't matter what signature. However, the signature of ballpoint pen has many shortcomings, for example, the words written with ballpoint pen are not kept for a long time, and the handwriting is blurred after a long time.

To sum up, even a pencil signature is legally binding. Just to preserve the handwriting for a long time, it is generally required to sign with a black 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.