费县许家崖天景区现有梨园面积 1 0 0 0 hm2 ,但因品种老化、树龄较大、管理粗放 ,经济效益较低。为提高经济效益 ,我们于 1 997～ 2 0 0 1年进行了高接换种试验 ,取得了良好效果。高接树第 2年见果 ,树冠恢复 ;第 3年丰产 ,平均株产 1 86.6kg,经济效益提高 4.3倍。1　试材与方 Xujiaxian Cliff Day scenic area existing pear area of ​​1 000 hm2, but because of the variety of aging, older, extensive management, lower economic efficiency. In order to improve economic efficiency, we conducted a high-exchange test from 1997 to 2001 and achieved good results. In the second year of Gaojian tree, the fruit is seen and the canopy resumes. In the third year, the yield is high, with an average of 866kg and the economic benefit is increased by 4.3 times. 1 test material and side