Abstract: Sequential analysis of qualitative and quantitative responses are described in detail and an example of pharmacological studies of Kuan-Xin-Su-He pill is presented.For the tests, the experimenter must decide in advance what differences between the true effects of the treatments he wishes to be fairly certain of detecting, if it exists, and what risks of failing to reach a correct conclusion he will accept. A criterion of the sequential test can then be defined. According to the criterion, a simple graphical method can be performed by tables herein recommended.