Many materials in engineering have the properties of different elastic modulus in tensile and pressure. In the early 21st century, it was found that the graphene material with the greatest strength has been verified as a material with different modulus of tensile and pressure. graphite is the source material of graphene. due to its good radiation resistance, it is widely used in national defense nuclear industry. studying the mechanical properties of different modulus of materials is becoming a new research trend. By testing the mechanical behavior of MSL82 type graphite, the ratio of different modulus of tensile and pressure is proved and obtained. The elastic-plastic analysis model of curved beams with different modulus is also established. the accuracy of the theoretical model is verified by comparing with the test data. The results show that in the elastic stage, the position of the neutral axis is inclined to the lower compression side but does not change with the load. after entering the plastic stage, with the increase of external load, the position of the neutral layer rises, and the final position is determined by the ratio of the yield limit of the tensile pressure; with the plastic development of the section, the influence of the tensile modulus ratio on the stress distribution of the section decreases gradually, but the influence on the strain is still large. therefore, the maximum tensile strain of the section can be controlled by changing the tensile modulus ratio.