Legal analysis: 1. After the project is completed and accepted, the construction unit shall submit the relevant materials to the registration hall of the labor and social security department to apply for the return of the wage guarantee fund for migrant workers. 2. The construction unit will submit written materials and opinions issued by relevant departments to the Municipal Clearing Office, and the construction unit will go through the refund formalities with the following materials to the Municipal Finance Bureau, and the Finance Bureau will refund the deposit together with the corresponding interest to the account of the construction unit.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

Article 577 Where a party fails to perform its contractual obligations or fails to perform its contractual obligations in conformity with the contract, it shall be liable for breach of contract such as continuing to perform, taking remedial measures or compensating for losses.