Abstract: This paper describes the structure and working principle of electronic throttle accelerator used in tractor, expounds the application of electronic throttle accelerator in tractor matters needing attention; This paper analyzes and diagnoses the failure of electronic throttle accelerator in the operation of a tractor, on the basis of which, summarizes the common electrical faults and causes of electronic throttle accelerator used by tractor, and provides a solution for the circuit faults of electronic throttle accelerator used by tractor.