Abstract: Rotary kiln is a key equipment in the production of metallurgy,cement and refractory material.It is a statically indeterminate system with overload,large torque and multi-supporting.Because of axis line deflection and asymmetric load distribution of rotary kiln,the support parts may break,spall,or erode due to the induced overlarge contact stresses.Based on Hertz contact theory and the linear relation between load distribution and axis line deflection,the relational expression between contact stresses of supporting system and axis line deflection is derived.The contact problem of some support structure is solved with the finite element method,and contact areas and contact distortion/stress are obtained.The analysis results are consistent with practical production,which can provide effective theoretical guidance for adjusting rotary kiln into best operation state.