Abstract: Aiming to uncover the principle of different ratio of BB fertilizer about N,P2O5,K2O in the wheat yield,using randomized block design,the effects of BB fertilizer under 5 different ratio were researched in the village of Dongnan,Shuiguo town,central district of Zaozhuang city in 2013.Moreover,the changes of leaf area index under the action of BB fertilizer were discussed.The results showed that the BB fertilizer can improve leaf area index of wheat as base fertilizer and the yield of wheat was increased.It had the best effect according to 375 kg/hm2 N,165 kg/hm2 P2O5 and 150 kg/hm2 K2O,and the range of increased yield reached to 16.9%.