In an optical equipment carriage parts as an example,analyzed the problem of the sliding frame bearing and the sliding rod relative motion slide bar existed serious wear。Based on the failure analysis of the existing sliding structure of sliding structure,many optimization analysis is made,the optimal design scheme of sliding structure is obtained,and the design of the sliding structure is new。Practice to verify the actual service life of the new structure,the results show that the new structure can effectively reduce the sliding wear of the sliding rod。