The probability finit element calculation of bending strength dependability for gear of pin tooth gear pair is carried out by the aid of the Monto-Carlo simulating method in software ANSYS 9.0 that is used for finit element analyzing.Probability of the appointed value that is greater than the greatest equivalent normal stress

sensitivity of the random responsing result relative to random input parameters

equivalent normal stress while probability is affirmatory

pole figuer of the greatest equivalent normal stress

the discrete figure of output parameters are obtained relative to the above all input parameters and the correlative coefficient of connecting input parameters with output parameters are obtained regard the greatest bending equivalent normal stress as random output parameters.And reliable theory basis and the feasible method for dependability design of gear of pin tooth gear pair and similar accessory are provided.