The complicated working condition results in the existence of multiple failure modes in aeroengine blade

and the failure rate of those failures is closely related with the operating environment

so

it is difficult to analyze the reliability of engine blades and control its risk. To solve the problem

firstly

based on the characteristics of wear and thermal crack failure modes commonly existing in rotor blades

the wear and thermal crack failure models with variable environment were researched

respectively. Secondly

a reliability analysis method based on competing risk model for rotor blades was proposed

and the corresponding algorithm was given. Finally

a high pressure turbine（HPT） rotor blade was analyzed and studied as an example. And the result showed that the risk was higher under single failure model compared with the competing risk model. When the competing risk model was employed in the reliability analysis

if the impact of thrust was not considered

the risk increased by 33% given the unreliability of 0.1

verifying the practicability of the proposed method.