Contract disputes refer to all disputes between the parties to a contract due to the effectiveness, interpretation, performance, modification and termination of the contract. Main type: 1. Dispute over the validity of the contract 1. Invalid contract dispute refers to the dispute between the parties to the contract caused by invalid contract. 2. Effective contract disputes refer to all disputes arising from the performance of the contract under the premise that the contract takes effect, including the interpretation of the contract content by the parties after the conclusion of the contract, the performance of the contract and the liability for breach of contract, the modification, suspension, transfer, dissolution and termination of the contract, etc. Most contract disputes are valid contract disputes. Oral and written contract disputes 1. Oral contract disputes refer to all disputes arising from the performance of oral contracts by both parties. 2. Written contract disputes refer to all disputes arising from the performance of a written contract by the parties to the contract. Third, related contract disputes at home and abroad. Fourth, there are unnamed contract disputes. This is to divide the contract from the perspective of whether the contract name is legal or not. The contract law specifically stipulates that a contract with a name is a famous contract and other contracts are nameless contracts. Five, format contract disputes and non-format contract disputes in addition to the above five ways to divide contract disputes, but also from other angles, such as contract conclusion disputes, contract performance disputes, contract change disputes, contract transfer disputes, contract termination disputes and so on.