In order to select SAR matching areas with high matching accuracy and matching probability, the current study analyzed the error influence of INS and imaging parameters on the matching area, designed several kinds of rules for suitability analysis, and proposed a coarse-to-fine selecting method. The method fully considers the macroscopic and microcosmic requirements, and keeps it away from the difficulty of constructing predicting functions. Experiment results indicate that the method can select good matching areas in the SAR image matching system, and achieve an over 97% matching probability of the selected matching area.