Abstract: Based on the study of the 2-dimensional position correlation information among resolution cells of a distributed target, a new method for distributed targets detection in SAR image is proposed. Several forms of the method based on different range measure definitions are proposed and compared with the CFAR detection by simulation and experiment, the results and performance analysis show the validity and advantage of the proposed method. By comparing the detection performance and computation complexity of the three range measure definitions with each other, the optimal one is determined.