Abstract: [Aims] In order to study the influence factors to wheat yield, the direct and indirect influence factors of wheat yield were analyzed. [Methods] The research was conducted in the Chinese academy of science in Changwu on the central loess plateau of Shaanxi province during 2005 to 2008 using wheat variety “Chang Wu 89134”. The relationship between main agronomy characters and wheat yield was analyzed. The correlation and path analysis were also analyzed between them. [Results] Yield was positively correlated with the spikelets per spike, grain weight and height while which was negatively correlated with per panicle, and there was no significant correlation between yield and the total aboveground biomass weight, dry weight per plant, and per spike spikelets. There was positive direct effect of spikelets per spike and plant height to the wheat yield by path analysis (rspikelets per spike=0.712**，rplant height=0.848**，P<0.05), while a direct negative effect was shown from total aboveground dry weight and per panicle to the yield(rtotal aboveground dry weight=-0.792**，rper panicle=-0.784**，P<0.05). [Conclusions] The spikelets per spike and plant height had positive effect to yield of ‘Changwu 89134’ while upper dry biomass and per panicle number had negative effect. So we could improve the yield by this four agronomic characters. Beside that we could coordinate the relationships with these agronomic characters to improve the yield of wheat.