The fruits of Pyrus ussuriensis Maxim need the softening process before eating,but the softening fruits are very difficult for storage which seriously affect their edible period and commercial values further restrict the development of the P.ussuriensis Maxim pear industry.The mechanisms involved in the softening process after harvest are deeply needed to study for the further development of pear industry.In this work,the Jingbai,Nanguo,Huagai,Jianba,Anli pear varieties from P.ussuriensis Maxim were treated...