In order to accurately, reasonably and effectively determine the type of equipment spare parts, a method based on grey relational model is proposed. Starting from the factors affecting the determination of spare parts, such as economy, maintainability, criticality, failure rate and order cycle, the parts and their components are analyzed. The example analysis results show that the method can solve the problem of determining the variety of spare parts, improve the scientificity and accuracy of decision-making, and verify the effectiveness of the model.