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The thermal dynamical and rheological properties as well as mathematical simulation analysis of rice seeds were studied by dynamic mechanical analysis (DMA). A long grain hybrid rice variety (Jinyou 974) grown in Hunan Province of China was used in this investigation. The results showed that the thermal transition was observed obviously and the length change of rice seeds with a loaded constant force along the major axis direction was detected during temperature scanning. The glass transition temperature decreased from (71.37±2.76)℃ to (31.84±2.51)℃ with moisture content increased from (11.3±0.23)% to (24.3±0.47)%. Both the linear function and Gordon-Taylor model can adequately represent the variation of glass transition temperature with moisture content (R2> 0.98). In order to do more in-depth study of thermal dynamical properties of rice seeds, the creep and stress relaxation characteristics were tested on the basis of temperature scanning. 5-element Kelvin model and 3-element Maxwell model could match the creep and relaxation behavior of rice seeds well and the results showed that the creep behavior was significantly affected by its moisture content and length, while the relaxation behavior was only influenced by its moisture content. These indicated that there would be unavoidable stress cracks because of the influence of creep and relaxation during storage and transportation process.