Abstract: According to abnormal complicated stress problem occurred in the site application of the middle pans in the scraper conveyor of coal mining face, with th e analysis on the site performances of the middle pans, mechanics model under two different performances of the scraper conveyor and powered support moving forwar d was established. The related calculation formula was inferred. Meanwhile, based on the circumstances, with the CAD /CAE functions of the Pro /ENGINEER and ANS YS software, a finite element strength analysis and study was conducted on the middle pans of the scraper conveyor. The analysis results showed that stresses of the major middle pans and pushing trunnion were all below 300 MPa and the stresses at the tow ends of stressed dumbbell were less than yield limit. Thus the strengths of the middle pans, dumbbell end and other key parts could meet the designed requirements when the powered supports were pushed forward. The end of the raised part would be the stress concentrated area and would easily be a tensile failure. The round part size of the end should be enlarged to reduce a stress concentration. With op timized design of the structure, the problems possibly existed in the actual application of the middle pans were solved and the relibility and service life of middle pan C ould be ensured.