Abstract: Evidence reasoning has good performance in dealing with uncertain information and has been used in many fields. It is necessary to analyze its robustness. We first give the definition of robustness based on the aim of evidential theory and the define a new concept "conflict rate". Using the sectional conflict rate, we analyze the robust area of Dempster's rule, weigh distribution and absorptive method. Finally, computer simulation indicates that, two new rules are more robust than Dempster's rule. Moreover, we give a robust area of Dempster's rule according to the general identification frame.