党的十九大报告明确提出，到2035年，基本实现国家治理体系和治理能力现代化。协同治理成为当前公共管理研究的前沿之一。在新型城镇化的大背景下，城市基础设施建设依然处于快速发展时期，需要新建、改建或扩建大量的政府投资项目。地方政府投资项目需要在政府各部门的共同参与和配合下，才能顺利实施建设，实现项目治理的目标。研究地方政府投资项目跨部门协同治理问题对于理顺部门关系，推进地方政府投资项目建设，建立地方政府投资项目治理长效机制具有现实意义。本文基于跨部门协同治理的视角，采用一个描述框架和一个诊断框架对地方政府投资项目展开研究。在描述框架下，本文主要从结构性机制和程序性机制两个方面，分别介绍了中国地方政府投资项目跨部门治理的模式和M市政府投资项目跨部门治理的模式。在诊断框架下，通过问卷调查研究，对M市政府投资项目跨部门协同治理影响因素进行实证研究。然后以M市为例展示地方政府投资项目跨部门协同治理的典型案例，针对案例中的问题，结合问卷调查结果，对地方政府投资项目跨部门协同失灵的现象进行分析。分析框架运用跨部门协同有关理论展开分析，具体包括技术理性层面分析和制度理性层面的分析。本文认为，协同动力不足、协同技能不足和信息沟通障碍是技术层面的三个主要因素；组织制度、协同法治和协同文化是制度层面的三个主要因素。最后，从微观层面提出了M市完善政府投资项目跨部门协同治理机制的建议；宏观层面从顶层制度设计的视角给出政策建议。

The report delivered at the 19th National Congress of the Communist Party of China made it clear that the modernization of China’s system and capacity for governance would be basically achieved before the year of 2035. Collaborative Governance has become an academic frontier in the area of public administration. Under the background of new-type urbanization that the quick development of infrastructural construction in cities, there are large number of new and rebuilt local government investment projects are being conducted. Local government investment projects need the participation and cooperation of various government agencies, so that the projects can be successfully built and the goal of project governance can be achieved. It is of practical significance to study the cross-agency governance of local government investment projects, to straighten out the relationship between agencies, promote the construction of local government investment projects and establish a long-term mechanism for the governance of local government investment projects. Based on the perspective of cross-agency collaborative governance, a description framework and a diagnostic framework are respectively used to study local government investment projects. Under the description framework, this paper mainly from two aspects of the structural mechanism and the procedural mechanism, respectively introduced the mode of the cross-agency governance of the local government investment projects of China and the city of M. Based on the framework of diagnosis, this paper conducts an empirical study on the influencing factors of cross-agency collaborative governance of government investment projects through questionnaires in the city of M. Then take M city as an example to show the typical case of the cross-agency governance of the local government investment projects. In view of the problems in the case and the results of the questionnaire survey, this paper analyzes the phenomenon of the collaboration failures. The analysis framework including technological rationality level and institutional rationality level applies the theory of cross-agency collaboration to analyze. This paper argues that insufficient dynamics, lack of collaborative skills and communication barriers are three main factors in the technological level. Organizational system, collaborative rule of law and collaborative culture are three main factors in the institutional level. Finally, this paper puts forward the suggestion of improving the cross-agency collaboration governance mechanism of the government investment projects in M City at the micro level, and gives the policy suggestions from the perspective of the top level system design at the macro level.