A pot experiment was carried out in Sichuan agricultural university to check the effect of different kinds and amount of nitrogen fertilizer on quality of Mengshan tea in western Sichuan. Results were achieved as follows: Kinds, amount, kinds and amount of fertilizer all had significant effect on tea qualities(except soluble sugars).Contents of tea polyphenols(TP), catechins and caffeine were markedly increased by applying the five kinds of nitrogen fertilizer. TP, catechins and caffeine were higher in using 4 g/pot pure nitrogen than other amount. Catechins and amino acid were higher in (NH_4)_2CO treatment than other nitrogen fertilizer treatment. Content of NO_3~- and NO_2~- were significantly increased using NO_3-N fertilizer included NH_4NO_3 and Ca(NO_3)_2, but amount of NO_3-N fertilizer had no effect on content of NO_3~- and NO_2~-. The NH_4-N fertilizer and urea had few effect on content of NO_3~- and NO_2~-. Considering qualities of tea picked in spring, summer and autumn, urea was the best nitrogen fertilizer, and 8g/pot was the optimum amount.