Optimization of spares inventory based on supply availability

This paper chooses spares inventory optimization of typical series-parallel connection system as a research object, and then the spares inventory optimization model based on the marginal analysis method is built through taking the system supply availability as the optimization target, while spares total cost as the constraints. In the end, the application validates that the model is effective and practical. The result can supply a theory basis for spares support cost´s reasonable distribution.