Abstract: In the present study， three hybrid rice cultivars with different vigor levels were used to evaluate three seed vigor testing methods， including standard germination test， low temperature germination test and high temperature pre\|germination test. The results of three methods were correlated with the results of seedling percentage in field. The results showed that germination indexes of standard germination test， germination percentage on the 10th day of low temperature germination test and germination percentage of high temperature pre\|germination test were all significantly positively correlated with seedling percentage in field. Besides， correlation coefficient between germination rate of high temperature pre\|germination test and seedling percentage in field were the highest. The results suggested that high temperature pre\|germination test was an appropriate seed vigor method for determination of rice seed vigor.

Key words: hybrid rice （Oryza sativa L.）, seed vigor, seedling in field, high temperature pre\, germination, low temperature germination