Constructing ecological security pattern by accurately extracting ecological space elements is an important way to maintain biodiversity and enhance ecosystem functions. Taking the Fujiang River Basin as the study area, the morphological spatial pattern analysis (MSPA) was used to identify the ecological source patches, and the landscape connectivity index was used to evaluate the importance of the patches. Based on the evaluation of ecological risk level, the cumulative resistance surface is established by using the minimum cumulative resistance model (MCR), so as to simulate the ecological corridor and extract the ecological nodes on the corridor, and construct the ecological security pattern of the Fujiang River Basin with the ecological source as the “key patch”, the ecological corridor as the “axis”, and the ecological node as the “hub”, and form an ecological security network of “source-corridor network and habitat connectivity”. The results show that: 1) The ecological source area of the Fujiang River Basin is 11 834.31 km2 accounting for 29.96 % of the total area of the basin, which is mainly distributed in the upper reaches controlled by the Minshan fault block and the Longmenshan fault zone, and scatteredly distributed in the parallel mountains of eastern Sichuan. 2) The total length of the ecological corridor in the study area is 2 249.32 km, the corridor along the main stream of the Fujiang River is the longest, reaching 434.32 km. The corridor has high utilization rate in the process of biological migration, energy and information flow. 3) The 25 ecological nodes were located in the low value area of ecological resistance along the corridor, which became the “stepping stones” and “temporary resting points” on the way of species migration. 4) The ecological security network of Fujiang River Basin is constructed based on the “source-corridor-node”, and the idea of “one corridor and two areas” (the ecological water corridor of the Fujiang River, and the ecological source areas at both the northern and southern ends of the river basin) ecological construction is put forward to ensure the connectivity between ecological sources, the integrity and stability of ecological network. The above results can provide scientific support for identifying the key areas of ecological restoration and ensuring the normal play of ecosystem services in the Fujiang River Basin.