Study on the mechanism of high efficiently utilizing nitrogen of potatoes in different seasons could direct the application of nitrogen fertilizer and promote the utilization efficiency of nitrogen fertilizer. Through pot culture experiment in spring and autumn, the differences of nitrogen accumulation and physiological property of function po-tato leaves in six nitrogen levels were studied. The results could be summarized as follows:(1) With the increasing rate of nitrogen applied, the nitrate nitrogen content of spring potatoes increased, but that of autumn potatoes de-creased after first increase. And the nitrate reductase ( NR) activity of potatoes both in spring and autumn increased first and then decreased. Under the same nitrogen level, the peak value of NR activity of spring potatoes in tuber for-mation and maturity stages were 35. 3% and 74. 0% higher than those in autumn. (2) The nitrogen content and ni-trogen accumulation of potato plants both in spring and autumn increased with the inceasing nitrogen fertilizer. But these two indicators of potatoes in spring were both higher than those in autumn under the same growth period and ni-trogen levels. (3) There was a higher correlation coefficient between the nitrate nitrogen content and the total nitro-gen content in potato plants, which could induct the effective utilization of nitrogen.%为探讨不同季节马铃薯氮素高效利用的相关机理，指导不同季节马铃薯的氮肥运筹，提高氮肥施用效率。通过春、秋季盆栽试验，比较6个施氮水平下春、秋马铃薯氮素积累及功能叶片生理特性的差异。结果表明：（1）随施氮量的增加，春马铃薯硝态氮含量增加，秋马铃薯则先增后减；春、秋马铃薯硝酸还原酶活性均随施氮量增加呈现先增后减。同等肥力下，块茎形成期与块茎成熟期春马铃薯的硝酸还原酶活性峰值比秋马铃薯分别高出35.3％、74.0％。（2）春、秋马铃薯植株氮含量、氮素积累量随施氮量的增加而增加；同一生育时期同等肥力下，春马铃薯植株氮含量、氮素积累量均高于秋马铃薯。（3）生理指标中叶片硝态氮与植株氮含量相关系数较高。
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