In this experiment,the compact type maize variety ’Xianyu 335’ was chosen as the test material, and 1/4,2/4,3/4 of the leaves were cut and 1/2 of the spikes were cut Effects of changes of source and sink on yield of maize were studied.The results showed that effect of source reduction treatments on dry weight and yield was bigger than that of sink reduction treatments,whereas effects of sink on volume of grain was bigger than that of source.It is obvious that keeping a relative balance between source and sink and keeping more grains and storing more dry matter is an important cultural measure in high-yield production of maize.