Legal analysis: If the construction unit does not start work according to the time specified in the project contract, and still does not start work after being urged by the construction unit, the construction unit may notify the construction unit to terminate the contract and demand liability for breach of contract.

Legal basis: "People's Republic of China and Civil Code"

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

Laws and administrative regulations or the parties agree that a contract should be concluded in writing. If the parties do not use writing but one party has performed its main obligations and the other party accepts it, the contract is established.

Article 502 A contract established in accordance with the law shall take effect from the time of its establishment, unless otherwise provided by law or otherwise agreed upon by the parties.

In accordance with the provisions of laws and administrative regulations, if the contract should be approved and other procedures should be followed, the provisions shall be followed. If the failure to go through approval and other procedures affects the effectiveness of the contract, it will not affect the effectiveness of the contract's obligations such as reporting for approval and the effectiveness of related clauses. If the party that should go through the application approval and other procedures fails to perform its obligations, the other party may request that it bear liability for violating such obligations.

In accordance with the provisions of laws and administrative regulations, if the modification, transfer, termination, etc. of a contract require approval and other procedures, the provisions of the preceding paragraph shall apply.

Article 577 If a party fails to perform its contractual obligations or performs its contractual obligations inconsistently with the agreement, it shall bear liability for breach of contract such as continuing to perform, taking remedial measures, or compensating for losses.