Abstract: The research shows that there are 2l species of main pear pests and diseases．Percentage of damage reaches to 20％ ～ 50％ per year Using pear bagging，the control efficiency of borers and fruit sucking moths reaches to 100％ and those of pear scal，leack apot disease，wheel vein disease，pentomid lags and pear psyllids all reach to 90％ ．After pear bagging，the changes of temperature and humidity are little，liotope is steady，pear fruits avoid any other badly environmental sumuladon Physiological diseases such as pear rust，water rust，etc．are alleviated evidently．Frequency and quantity of pesticide are reduced by more than 70％ ．Fruit surfaces are smooth．fruit color is light．fruit dots are little and superficial It is a new way to produce the excellent green pear fruits．