| This dissertation used 6-7 tomato lines from Agronomy and Biotechnology college of CAU, which have been fixed by selfing several generations. The high temperature stress tolerance of lines 128, 122, 125, 126, 131, 137 are evaluated by using the subject function values in 35℃/25℃(d/n) and 38℃/28 ℃(d/n), low temperature stress tolerance of lines 128 , 125, 122, 133, 137, 131, 126 in 12℃ and 8 ℃. Based on the result of the evaluation, the dissertation mainly studied the effect of temperature stress on tomato of the hormones content and their correlation. The main results are as follows:(1) It is good putting tomato plants in 38℃/28℃(d/n) when we study the changes the tomato materials make under heat temperature stress. At the same time, when we studied the cold resistance, 12 ℃will be a good condition to deal with the plants.(2) ABA and GA3 contents rise apparently in heat temperature comparatively to the CK temperature (25℃/15℃(d/n) ), IAA and Z+ZR level drop apparently in inverse.(3) The correlation between ABA relative content of tomato in 35℃/25℃(d/n) and the heat tolerance is significent, rABA=0-8319*; the correlation between Z+ZR content in 38℃/28℃(d/n) and it's heat tolerance is quite significant, rZR=-0.9213**. The ABA relative content in 35℃/25℃(d/n) and the Z+ZR content in 38℃/28℃ (d/n) can be used to evaluate the heat tolerance of tomato.(4) ABA and Z+ZR contents rise apparently in cold temperature comparatively to the CK temperature, GA3 drop apparently, and IAA dosen't drop apparently.(5) There is no significent correlation between tomato hormones contents and the cold temperature stress tolerance. The contents of tomato hormones can't be used to evaluat the cold tolerance.(6) Get one material (128) having good tolerance both to high temperature and low temperature.
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