Abstract: During the flowering and filling period of medium rice in 2016 and 2017,heat damage in rice was serious because of the long-term high temperature in Macheng. The main contents of this paper includes the observation of the regional variety test and production test in the middle-season rice green channel test by Zoeve seed;the normalization treatment of observational data;analysis of different performance of various medium hybrid rice under high temperature stress;further analysis of calculation results with graphic method;summary of characteristics of high temperature resistant varieties.

Key words: medium indica hybrid rice, high temperature stress, high temperature resistance, growth characteristic, yield