Abstract: 17 Chinese cabbage varieties were cultivated in high density nitrogen solution to analyze the nitrate content of different varieties of different periods. The result showed that the difference of content of nitrate reached extremely remarkable between different varieties, the highest and the the most low one differ by more than two times. The nitrate reductase activity and the nitrate content reached evidently negative correlation, but there were also such varieties exist that the nitrate content was lower and the nitrate reductase activity was also lower. Through analysiswe can draw a conclusion that it can be cultivated through breeding way for the varietieswith lower quantity of nitrate accumulations.

Key words: Chinese cabbage, Variety, Nitrate, Accumulation