Number each blank paper to be stamped, print the number on the blank paper, make a table file, and list the information needed to master such as the purpose and number of numbered blank papers. Under normal circumstances, it is not recommended to stamp the official seal on white paper for business handling. If the management is not rigorous and there are uncertain risk factors, once there are problems, enterprises need to bear corresponding legal responsibilities. Article 490 of the Civil Code If the parties conclude a contract in the form of a contract, the contract is 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.