Defects of Bayes hypothesis test method based on posterior loss and sequential posterior odd test (SPOT) method based on risks were analyzed. According to the requirement of binomial product's Bayes sequential test in equipment test and evaluation

considering the constraints of producer's risk and consumer's risk

posterior probability based sequential test model (PBSTM) was constructed

the PBSTM solving algorithm and formulas of actual posterior risks were presented. At last

with an example in equipment reliability analysis

the superiority and effectiveness of PBSTM was proved by data.The result shows :PBSTM guaranteed in theory that the results of sequential test can satisfy the small probability event principle and risks requirement simultaneously

and avoid the defects of existing methods.