Abstract: In order to prevent lodging, to achieve high and stable maize was treated by chemical control agent-ethephon to study its effect on main traits. The results showed that, characters of length of three ear-leaves, basal internode length, plant height, ear position, ear length and individual plant yield of maize treated was lower than that of the control, which inhibitory effect of length of three ear-leaves , internode length followed the turns: earlier stage >mid stage >late stage. At the same time, with the dose increasing length of three ear-leaves, plant height, ear position, ear length and individual plant yield decreased gradually and internode length showed no significant difference. With the time delaying, height of ear position showed the tendency of high - low - high; plant height gradually decreased; ear length didn’t change significantly; Except for yield decreasing reduction of ‘Jinfeng 50’ by ethephon showing the following tendency of low - high - low, yield decreasing reduction of ‘Jinfeng 50’ and AH2067 by “XISHIMEI”, or AH2067 by ethephon showing the tendency of high-low-high. Effect of chemical control agent on the ear rows and bald length was not significantly affected.