Legal analysis: the method of drawing a horizontal line in the blank of the contract: there cannot be a whole line of blank in the middle of the contract. If there are a lot of spaces at the end of the contract, you can mark them after the last line of valid text: if the spaces below are fixed-format contracts, there are handwritten spaces in the middle, which will be crossed out when it is determined that it is not necessary to fill in. The contract must be filled in with a black pen or pen, not a pencil or ballpoint pen. The content must be complete, the original and the original content must be consistent, and shall not be altered. 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.