According to the PPP Unit of the Ministry of Finance，from April 2014 to April 2022，there were 10304 PPP warehousing projects，with an investment of 16.4 trillion yuan. PPP has reached a new level，but how to develop from a large-scale project to a high-quality PPP project and how to give full play to its potential economic and social benefits is extremely urgent. The core of high-quality development of PPP is effective performance management. To achieve the integration of PPP project performance management and financial budget performance management is of great significance in comprehensively deepening the implementation of financial budget management，improving quality and efficiency of public services，and strengthening management throughout the project whole-of-life cycle. In order to explore a feasible path and mechanism to solve the deep integration of the two，this paper starts from the development history of PPP project performance management and financial budget performance management，expounds the necessity of integration of the two，deeply analyzes the difficulties and pain points such as inconsistency in connection and integration，and puts forward feasible paths and mechanisms such as zero-based budgeting reform，building a full-chain budget performance management closed-loop system，using budgeting methods to optimize the evaluation of financial affordability of PPP projects，and refining PPP contract terms，so as to achieve the standardized and high-quality development of PPP projects.