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In the development stage, there is a large number of test data. Aiming to making good use of the prior test data and reducing the sample number of testability demonstration test, a method for testability demonstration test design based on information entropy of prior test information is proposed. In the method information entropy is used to check the role of different prior test data for the testability demonstration test, and many times prior test data is equivalent to success or failure data at a time according to the principles of equal mean interactive entropy and equal total information. On this basis, compatibility of prior data and test data is established by the method of compatibility test, while Beta distribution is made use as prior distribution and the mixed posteriori distribution is established by weighted hybrid Bayesian theory. Then, testing scheme satisfying the risk requirement of producer and consumer is solved based on Bayesian average risk theory. At last, to verify the proposed method, an example of a certain type of transmitter is given, and the result shows the validity of the proposed method.