The law does not force the contract to be stamped with the riding seal, that is to say, the contract without the riding seal is valid, but the role of the riding seal is to prevent risks. The whole contract with the riding seal can restore the riding seal to the original seal, so it can prevent the other party from changing the contract content, preventing the other party from denying the contract content, and avoiding unnecessary troubles, disputes and losses caused by changing or denying the contract content.