Legal analysis: First of all, the contractor can confirm the project cost of the uncontroversial part with the employer, list the disputed items separately, negotiate with the employer alone or bring a lawsuit to the court. Secondly, if the Employer does not have the sincerity to negotiate, the Contractor shall bring a lawsuit or arbitration on all the completion settlement fees or disputed parts as soon as possible, and ask the Employer to pay the project payment and the unpaid project payment interest calculated from the actual delivery date of the project, so as to avoid delay. In addition, there is another trick: when signing a construction contract, try to stipulate in the special clause 3.2 that "Document No.369 of the Ministry of Construction shall apply", because this clause stipulates that the employer shall put forward the review opinions of the completion settlement within 20 ~ 60 days after receiving the completion settlement report and complete completion settlement data, otherwise it will be regarded as approval of the completion settlement report, so that once the employer delays the review of the completion settlement report, the contractor can ask the employer to pay the project payment according to the completion settlement fee calculated by himself.
Legal basis: Article 286 of the Civil Code of People's Republic of China (PRC). If the employer fails to pay the price as agreed, the contractor may require the employer to pay the price within a reasonable period of time. If the employer fails to pay within the time limit, the contractor may agree with the employer to discount the project or apply to the people's court for auction according to law, except that it is not appropriate to discount or auction the project according to the nature of the construction project. Priority should be given to compensation for the discount or auction price of construction projects.