Abstract: In order to explore a new method for determining elastic modulus of straight dry rice vermicelli, a post-buckling calculating model of elastic modulus was developed by using the mechanical model of compressive rod post-buckling. 4 samples with different lengths were selected and their calculated values of elastic modulus were analyzed corresponding with 4 end bending angles，and were compared with tensile method and three point bending method using TA-XT2i physical property apparatus. The influence of moisture content of dry rice vermicelli on elastic modulus was discussed by using the compressive rod post-buckling method determining elastic modulus. Results showed that the method based on the compressive rod post-buckling theory was optimal and the condition with length of 100mm, end bending angle of 15° of dry rice vermicelli was the best for testing . Moisture content and elastic modulus had a negative liner relationship. The results showed that the compressive rod post-buckling method determining elastic modulus of dry rice vermicelli is accurate, practicable and reliable, and can provide a reference for mechanics texture evaluation of straight dry rice vermicelli.