Abstract: To provide a theoretical basis for developing heat-resisting material and cryogenic temperature material，the tensile properties of nylon short fiber reinforced foam rubber composite materials with the identical spongy rate but different short fiber volume fraction and with the identical short fiber volume fraction but different spongy rate were tested at 213～398 K. The results show that increasing the short fiber volume fraction and reducing spongy rate can improve tensile properties of the composite materials at ordinary temperatures. At different temperatures，the initial modulus and breaking st rength of SFRFRC decrease with temperature increasing，and the elongation at break of SFRFRC increases at first and then decreases with temperature increasing. The glass transition temperature is between 213～233 K. At the same time，although the added staple fiber does not change the glass transition temperature of SFRFRC，it makes the range of glass transition temperature wider. The initial modulus，breaking strength and elongation at break of SFRFRC reached the lowest values at 398 K，which is related to the vulcanization temperature of rubber. The vulcanization temperature of rubber is 423 K. The closer to the vulcanization temperature，the worse the tensile properties of SFRFRC.