The cultivar of ‘Cuiguan’ was selected as material to study the effects of branch-drooping on the flower bud formation,the expression of blossoming related genes LFT,TFL1 and FT,and the content of endogenous hormones and nutrients.Results showed that:(1)90° branch-drooping treatment significantly increased the flower bud formation rate of ‘Cuiguan’ pear by a large margin.(2)After the treatment of branch-dropping,the expression of flowering promoting genes LFT and FT increased,while the expression of flowering suppressor gene TFL1 decreased.The contents of flower bud differentiation promoting hormones ZT and ABA increased,while the contents of inhibiting hormones GA₃ and IAA decreased.The ratio of C/N improved observably,while the content of nitrogen(N) descended.At the same time,the contents of soluble sugar and starch showed a large accumulation during flower bud differentiation.(3)Correlation analysis showed that LFY and FT gene expression had a positive correlation with the contents of ZT and ABA,soluble sugar,starch,and the ratio of C/N.And it had a negative correlation with the contents of GA₃,IAA,N,and TFL1 gene expression.This study suggested that branch-drooping treatment increased flowering promoting gene expression level by increasing flower bud differentiation promoting class endogenous hormone contents and nutrient contents during the process of flower bud formation,as well as interactions between these indicators together to improve ‘Cuiguan’ pear flower rate.