Research conclusions ： (1) The more attention should be paid to the technical characteristics of EPC project and the particularity of total price contract. The requirements of the owner and contract should be met with small cost. (2) The design scheme should broadly consider the interests and benefits of the project and the interests of all parties involved should be taken into account，especially the contractor. In addition，the technology，risk and investment control should be balanced. (3 ) The good strategy should be used to push on the change plan step by step and from easy area to difficult area on full consideration of the concerns of the owner and supervisor to persuade them to understand and accept the design scheme that is favorable for the all parties. (4) This research result can be as the reference to the similar works.