This paper gives a new technique of automatically recognizing for immunity in pharmacological experiment. The realization of automatization of pharmacological experiment is very important and widely needed in pharmacology research and medical diagnosis. At the first, the paper introduces the system component and procession. The microscope image with complicated background is segmented. To improve the recognition speed and accuracy of the system, a way of dispatching image and multiprocessing for isolated cell is presented. The parameters of blood cells are obtained automaticly. The testing shows that the deviation of obtained pharmacological parameter doesn't exceed.