TRISS method derived from logistic model made possible to stochastic assessment of trauma patient casualty. This probability applies the word probability of survival (Ps). This study was to develop the knowledge of Ps on each accident type. A selected data set for the study was based on Japan Trauma Data Bank (JTDB). Ps line was calculated by linearization of logistic model. As a result, bicycle accident has high probability of death in high conscious level.