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Speckle noise is caused by the natural form of ultrasound imaging system, and it has a great influence on the quality of ultrasound image and the accuracy of medical diagnostic. For traditional Perona-Malik (PM) by four directions adequate information and and the treatment effect is not obvious, The paper puts forward an eight selected model based on anisotropic diffusion of ultrasound image. For Perona-Malik(PM) anisotropic diffusion model experienced failure when dealing with strong noise, choosing parameter K of diffusion threshold relies on experience and doing not make sure the number of iteration termination, the paper improves the calculation method of diffusion coefficient, uses adaptive diffusion threshold and proposes the suitable iteration termination criterion. Compared with other similar methods, It not noly can controll the diffusion process compared to the conventional diffusion process, and improves robustness and efficiency of the algorithm. experiments show that the proposed algorithm has betterperformance for noise removal (PSNR) and edge-preservation (FOM). 