Abstract: Based on the engineering project performance index system, this paper builds a system dynamics model of engineering project performance under the partnering mode. The feedback loop branch vector determinant algorithm is used to get new feedback loops after introducing partnering mode. All the feedback loops are analyzed to find out the promoted kernel causal chains and the restricted kernel causal chains. It is shown that under the partnering mode, the project management capacity and organizational effectiveness are the main reasons to promote engineering project performance, while the cost of partnering is the main reason to restrict engineering project performance.