A credibility test method based on the featu res of the linear regression is proposed to evaluate the blind processing result s of binary phase shift keying (BPSK) signals such as the modulation recognitio n and parameter estimation. The reference signals are first constructed depending on the certain identified modulation results. Two features, the ordered re gression factor and sign of the segments regression, are defined to test the cr edibility of the processing results by analyzing the differences of linear reg ression characteristics of the correlation series modulus between the ori ginal and the ascending order. Simulation results show that the proposed method can be used to effectively verify the credibility for blind processing results o f BPSK signals both at low signal to noise ratio and the condition without a prior knowledge for signal parameters.