1. When stamping, the riding seam shall be stamped and the riding seam seal shall be complete;
2. The seal should be consistent with the usual contract subject matter, and the column of contract parties is different from the seal subject matter;
3. It is best to use blue-black ink when signing, so that it is easy to distinguish whether it is the original;
4. If the parties conclude a contract in the form of a contract, it shall be established when the parties sign or seal it.
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.