With the increasing complexity of aircraft landing gear retractable mechanism， the effect of multiple structural clearances coupling on the motion accuracy of the mechanism is more significant. The motion accuracy reliability of complex mechanism presents the characteristics of high nonlinear degree， many influencing parameters and small sample size， so it is very difficult to study. For this problem， this paper proposes a method for analyzing the motion accuracy reliability of the mechanism by combining theoretical analysis， dynamics joint simulation， and clearance wear. Firstly， a dynamic model of the retractable mechanism considering seven structural clearances is established to study the independent and coupled effects of structural clearances on the retracting accuracy. Then， the analysis model of the structural wear with the increase of retracting cycles is established to obtain the change rule of clearance， and then the reliability analysis model of retractable mechanism motion accuracy with the change of retracting cycles is established. Finally， based on the adaptive Kriging surrogate model， the reliability of the landing gear retractable mechanism is analyzed， and the variation law of reliability with retracting cycles is provided. The research results show that the structural clearances at different locations have varying degrees of impact on the motion accuracy of the mechanism， and the probability of mechanism failure shows a trend of initially stabilizing and then sharply increasing. The proposed analysis method provides an important analytical means for the motion reliability evaluation of complex landing gear mechanisms.