Communicate and coordinate with the other party to the contract, correct mistakes and sign a supplementary agreement. When revising the format of economic law practice contract, it is necessary to communicate and coordinate with the other party, correct the mistakes and sign a supplementary agreement. A contract is an agreement between the parties to establish, change or terminate a civil relationship. Since the establishment of the contract, all parties should be bound by the contract. If the situation changes, it shall be dissolved through consultation.