Laser speckle contrast imaging (LSCI) technology can provide non-invasive and highly effective therapeutic evaluation method for traditional chinese medicine physical therapy. However, the stability of this assessment method needs to be improved. Based on near infrared laser light source, the speckle imaging experiment was performed and the original experimental data was obtained. The data processing results of the new contrast processing algorithm based on RT(Roll with time-sampling) were analyzed. It can be seen that based on the regularity of the contrast distribution the distribution obtained by the RT algorithm was more even as some of the noise was filtered. Therefore, RT algorithm could improve the stability of the laser speckle contrast distribution.