In the engineering project of government-leading, which usually uses the management mode of IMS (Investment-Management-Supervision). There are many related parties, which all have their own tasks, goals and interests. Managers have to communication and coordination all parties for smooth implementation. Especially in the group engineering project, the more related parties which increase difficulty of communication management, the effect and effectiveness will be a directly influence in progress of the engineering project. All participants of the engineering project are forming the dynamic alliance which is temporarily for common goals and interests. The dynamic alliance will disappear after the completion of the engineering project. There is no long-term communication mechanism which could constantly improving in such an unstable organization compared to general companies. So, it is a hot potato for using the correct and rational communication mode.