Abstract：Total 18 different cucumber（Cucumis sativus L.）cultivars were used to study their response to low nitrogen stress by comparing their fruit yield，over ground biomass，total nitrogen uptake，fruit total nitrogen accumulate under normal and low nitrogen stress．The results showed that the fruit yield and total nitrogen accumulate of all cultivars were decreased under low nitrogen stress．Cultivar‘Jinlv No.30’and‘Meihao’decreased greatly，while the decline of‘Jinyou No.2’and‘Jinyou No.31’were smaller|the over ground biomass‘Jinyou No.2‘and‘Jinyou No.31’and the total nitrogen uptake of‘Jinyou No.31’were higher under low nitrogen stress than normal nitrogen，while the over ground biomass and total nitrogen uptake of other cultivars were decreased，especially‘Jinlv No.30’and‘Meihao’．From the above，we screened the stronger resistance to low nitrogen cultivars were‘Jinyou No.2’and‘Jinyou No.31’，and the worse cultivars were‘Jinlv No.30’and‘Meihao’．The correlation analysis showed that over ground biomass and total nitrogen uptake and fruit total nitrogen accumulate were very significantly correlated to the fruit yield under low nitrogen stress and normal nitrogen．Therefore，fruit yield，over ground biomass and total nitrogen uptake and fruit total nitrogen accumulate would probably be an effective index for screening cucumber cultivars which tolerant to low nitrogen stress．
