Nitrogen fertilizer is the world’s largest fertilizer production and use of fertilizer varieties，applying appropriate nitrogen fertilizer in the process of grape growth can increase the number of branches and leaves of grapevines，enhance tree potential，coordinate the vegetative growth and reproductive growth of the tree，and promote the germination of secondary shoots. However，excessive application of nitrogen fertilizer will cause branches to grow slightly，and the degree of lignification of new branches and roots will be reduced. At the same time，it can also cause problems such as non-point source pollution of vineyards. In order to explore the effects of nitrogen fertilizer reduction on grape growth and reduce the potential risk of non-point source pollution，‘Tiangong Moyu’ grapes were used as research materials to explore the effects of nitrogen fertilizer reduction and biodynamic hormone and silicon fertilizer on the fresh weight，dry weight，moisture content，chlorophyll content and photosynthetic indexes of pruned shoots in the early stage of grape growth. The results showed that compared with CK，the fresh weight and moisture content of shoots with the 40% reduction of nitrogen fertilizer topdressing rate(T40)were significantly higher than those of other treatments. There was no significant difference in the chlorophyll content of grape leaves under different fertilization treatments. The net photosynthetic rate，stomatal conductance and transpiration rate under T40 treatment were significantly higher than those of CK. There was no significant difference in CO₂ concentration between cells. The addition of silicon fertilizer 971.4 and 1942.8 kg·hm-2(TG2 and TG5)reduced the fresh weight and moisture content of grape shoots，indicating that it had an adverse effect on the growth of grape shoots. The addition of biodynamic hormone(TS) had no significant effect on the fresh weight and moisture content of grape branches. The addition of silicon fertilzer and biodynamic hormone(TG2S and TG5S)promoted the growth of grape shoots to a certain extent. TG2，TG5，TS，TG2S and TG5S treatments had no significant effect on the chlorophyll content of grape leaves. In conclusion，under the conditions of this experiment，nitrogen fertilizer reduction and topdressing could improve the photosynthesis of grape leaves，which was conducive to the growth of grapes and promoted the growth of branches.