Abstract: Based on the field test of geometric sizes and assessment of structural properties for supporting system with rectangular section, used for the conveyor of fully mechanized coal face at a simulated crossheading, as some structural diseases occurred after its construction, the calculating models according to finite element method are established and the numerical results are obtained, the survey conclusions drawn from the spot are verified also, finally the strengthening technical solution for the supporting system is presented, which can be referenced by the practice.