Abstract: High-pressure turbine guides are one of the important parts of aero-engines. Because of bad working environment, corrosion, burn, deformation, local bulge, cracking, block breaking-off and other faults often occur to them. In the present work, the failure of high-pressure turbine guides was discussed. The failure causes of high-pressure turbine guides were analyzed layer by layer by the fault tree method. Based on the logic decision method, on-site maintenance work was determined and maintenance schedule was formulated. It was put forward that the laser welding repair process was used to replace the traditional argon arc welding process, so that the problem of cracking again after the repair of high-pressure turbine guides could be solved. Other prevention and improvement measures were also proposed. The present work has theoretical significance and engineering practical value for saving engine maintenance cost, ensuring product quality and repair cycle, improving engine reliability, and ensuring the flight safety of the army.