A denoising method for coherent ladar range images is proposed based on non-local means (NLM) filtering. Combined with image fusion methods for images such as range image and filtered intensity image, median filter and NLM with background suppression (B-S), B-S and range anomalies can be realized. Image denoising are carried out on simulated coherent ladar multi-target images with different carrier to noise ratios, and the performances are compared with some other methods such as Lee filter. The results show that, the proposed method can satisfy the requirements from the aspects of background noise suppression, normal range values on the target and edge-preservation.