China’s national conditions and the advantages of urban rapid rail transit determine that rapid rail transit plays an important role in the sustainable development of urban transportation system. With the rapid development of the transportation construction industry，the impact on the area along the line is increasingly serious，how to effectively and reasonably promote the coordinated development of the surrounding area and rail transit has become a gradually concerned problem. This paper will take Chengdu Outer ring railway as an example to study the coordinated development path of protected natural areas along chengdu outer ring railway and Chengdu outer ring railway. Firstly，the basic situation of nature reserve along chengdu outer ring railway is described. Then combining with the basic situation of the natural protected areas along the line，the correlation evaluation index system of the outer ring railway and the natural protected areas along the line is constructed. According to the correlation score between them，they can be divided into three categories：strong correlation，general correlation and weak correlation. According to the different regional characteristics of the three types of protected areas along the line，different collaborative management paths are put forward according to local conditions.