Abstract: The relationships between yield composition factors such as grain weight per plant,100-grain weight,ear length,double ear rate and meteorological factors e.g.sunlight,heat,precipitation were analyzed,by using path analysis method.The result showed that the decision degree of grain weight per plant and ear length were the biggest contributor to the maize yield with decision coefficient by 0.3052.The grain weight per plant was the secondary biggest contributor to the maze yield with decision coefficient by 0.2538.Third one was the ear length with decision coefficient by 0.2114.The impact of different of meteorological factors on grain weight per plant and ear length was different for different growth periods.The precipitation and average temperature had the biggest direct effect on the ear length and grain weight per plant before heading period.The accumulated temperature(≥10℃) through the average temperature and sunlight hours contributed to the ear length during seeding to jointing period by the indirect effect.The ear length and grain weight per plant mainly had direct effect to the yield during jointing to heading period.Sunlight hours directly affected the ear length during seeding to jointing period and indirectly affected the ear length and grain weight per plant during jointing to heading period.The meteorological factors had less effect on the ear length and grain weight per plant during heading to mature period,while its effect showed mainly on yield consist factors in seeding and fringe period,but decreased after grouting period.Therefore it is critical for gaining the high yield to pay attention to the field manage and proper plant density.

Key words: Meteorological factor, Meteorological factor, Maize yield, Path analysis