Abstract: In order to explore the effect of nitrogen fertilizer on the seed vigor of wheat （Triticum aestivum L.） and find out the best fertilization amount, the wheat variety Jimai 22 was selected as the test material, the seeds under different nitrogen application rates were harvested for standard germination test, and the germination, seeding growth and physiological indexes of the seed were determined. The results showed that the yield and seed vigor index of wheat were the highest when the pure nitrogen application rate was 154 kg/hm² and 220 kg/hm², which was suitable for the production of high vigor wheat seeds. Under no nitrogen application, the seed yield and vigor index were the lowest, the seed water content was high, and the germination rate was the fastest, indicating that the seed texture of wheat with no nitrogen application became loose, and it was easier to absorb water during germination, thus accelerating the germination process. Under each nitrogen application level, the seed germination index did not change much. There was a very significant correlation between the absolute content of seed protein and the dry weight of seedlings （P<0.01）.

Key words: wheat（Triticum aestivum L.） seed, nitrogen fertilizer, seed vitality, germination index, protein content of seed