The goal of this research is to investigate the pricing methods of the continuous and service contracts. Methodology is analytical-descriptive using the library resources. The investigations showed that the fixed pricing model approach which has been defined for the projects with exact requirements and scope in the best way will not change. Each change needs to the additional estimation and the additional contract. Therefore, one of the main requirements is the use of the fixed cost pricing model, the definition of domain exactly and the technical requirements before it. Also in last years, EPC contract has been considered because of decreasing the employer risk and determination of the contract price and time from between the different methods of performing the project and the different types of the structure contracts. One of the important specifications of this contract is to be long time. By considering to this specification, it gets important to manage the relationship of the parties of contract during the project. The contractual adjustment conditions are going to exhibit the approach for the unforeseen events and or the inevitable changes in the contractual agreements between the parties. Among these inevitable changes are the increasing and or decreasing the narrative values and volumes of the contract, because it is almost impossible to foreseen the values and volumes of the contract exactly.
