In current electronic war, Towed Radar Active Decoy(TRAD) can capture the tracking resolution cell in the half-power beam of the radar, and the tracking gate is transfered from the target to the decoy. Under this circumstance, a new technology by which the target will be recognized correctly under the interference of decoy is in urgent need. The first step of realizing that is to separate the target from TRAD. Considering that the logistic regression model is a classification algorithm based on linear regression, so by using the logistic regression probability model, a new multi-Bayesian model based on MCMC is formed to separate the target from TRAD.