Abstract: Effects of zinc levels on yield and endogenous hormone and nitrogen metabolism in leaves of balsam pear(Momordica charantia cv Dading)were studied by field tria1．The results show that application of ZnSO₄·7H₂0 with doses from 30 to 45kg／hm² in zinc deficient soil can significantly increase the yields of balsam pear．from 16．21％ to l7．16％．Zinc application can also increase the IAA ，GA₃，protein，nuclear contents and NRase activity，but decrease the tryptophane，nitric nitrogen(N0)，free ammonic acids contents(FAA)and RNase activity in leaves of plants．The results also show that there is a significantly positive correlation between protein contents and nuclear contents，NRase，but a significandy negative correlation with NO₃ ，FAA and RNase，and a significantly negative correlation between tryptophane contents and IAA ．GA₃．nuclear contents and RNase activity．