Abstract: Roller groups as the key part of pipe belt conveyor,it forces belt wrapped into round tube in operation. At present,the design of roller mainly through empirical formula,taking bigger safety coefficient to design,which is easily caused some roller premature failure during operation because of the limited load is not reasonable. A type pipe belt conveyor is taken as an example,the coupled dynamic model is set up by considering the conveyor belt elasticity. The contact forces of rollers in constant speed and uniform acceleration are analyzed. Comparing with the rigid dynamic model analysis results,the average value of contact force reduced by approximately 80% ,and the fluctuating value in- creased about more than four times. It developed the larger alternating load to cause fatigue failure easily. At last,the experiment is taken to verify the coupled model analysis results in constant speed. The conclusions can provide a guid- ance for dynamic load and fatigue life research in full load operation condition.