Under the condition of a given theoretical censored test number

it's needed to gain a theoretical largest censored test number and design the experiment for the benefit of the consumers.Based on posterior probability and "small probability event principle" for protecting the customer's profit

the Bayesian sequential variance test (BSVT) model was modified

modified Bayesian sequential variance test (MBSVT) model was constructed

and the algorithms of solving the continuous test region critical value of sequential test were designed.The calculation method of average sample number (ASN) was also given.With an example

the solution and application of MBSVT model were illustrated.