Aiming at the actual situation of the lack of circuit breaker fault information, Sthis paper introduces a kind of high voltage circuit breaker based on principal component analysis of the whole life cycle cost calculation method. In which the whole life cycle cost model involves the investment, operation, maintenance, servicing, retirement costs of circuit breaker. Principal component analysis is used in the maintenance cost and maintenance cost calculation, extract principal component instead of all the data in the data. The contrast of calculation results before and after using the principal component analysis, find that the principal component analysis theory can improve the calculation accuracy, solve the problem of the fault information is incomplete.