It is illegal to change the contract without permission. The modification and dissolution of a contract means the partial modification, supplement or total cancellation of the established contract. When one party to the contract needs to modify or supplement some terms of the contract or dissolve the contract relationship for any reason, it must obtain the consent of the other party. That is, with the new agreement reached by both parties, the original old agreement is changed or dissolved. The new agreement to modify or terminate the contract shall still be handled in the form of the original contract.

changing the contract without permission is a breach of contract. Breach of contract means that one or both parties violate the obligations agreed in the contract, the obligations directly stipulated by the law and the obligations required by the legal principles and spirit. If one party fails to perform its contractual obligations or fails to perform its contractual obligations in conformity with the agreement, thus causing losses to the other party, the amount of damages shall be equivalent to the losses caused by the breach of contract, including the benefits that can be obtained after the performance of the contract, but shall not exceed the losses that the breaching party foresaw or should have foreseen when concluding the contract.