Based on the analysis of the speckle noise and PCNN′s properties,PCNN is introduced in to wavelet domain,by combining the thought of the solft-threshold de-noising,Soft-threshold de-noising method of medical ultrasonic image based on PCNN(ST-PCNN) is proposed.The advantage of ST-PC-NN is that PCNN recognizes the coefficients of high frequency in wavelet domain are realized,and then the wavelet coefficients are processed by corresponding methods.ST-PCNN improves the disadvantage that PCNN can not...