Abstract: According to the common cause failure mechanism and the conception of order statistics, by means of the mapping relation between sample strength distribution in a system and order statistics, new system reliability models are proposed on the basis of load-strength interference theory and two-end truncated order statistics for serial, parallel and k-out-of-n (F) voting systems, respectively. The Monte Carlo simulation validates the correctness of the proposed models. Reliability calculated by the two-end truncated order statistics model is more accordant with the actual reliability of a mechanical system, compared with that obtained by traditional independent failure models and common cause failure models.