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Interference fringes will be generated in SAR image when distributed targets' echo signal is simulated because of the uniform model of targets. The fringes can be suppressed by adding random height in space or random phase on backscatter coefficient of the distributed targets. However, the former method will introduce location error and the latter method will increase speckle noise twice in simulated image. In this paper, we develop a high accuracy method for fringes suppression based on targets' position randomizing and RCS re-sampling via bilinear interpolation. The validation of method is successfully proved by simulation results and the performance of the method is discussed on accuracy and computational complexity at the end of this paper.