2005年4月～2006年1月期间利用Trime土壤水分速测系统,分18次测定了烟台农科院梨园0～180cm范围内的土壤水分。对表层土壤水分与深层土壤水分之间的转换关系,及梨树在不同生长阶段对转换关系的影响进行了研究。结果表明,在梨树生长旺盛期和休眠期两个阶段内,0～10cm和0～30cm土层对深层土壤水分的预测效果都较差,0～50cm对深层土壤水分的预测效果较好,预测结果中相对误差大于12%的分别占26.67%和20.00%,最大相对误差依次为21.07%和15.05%;经验模型的预测精度偏高且各模型在生长旺盛期内的预测效果总体上较在生长休眠期内的预测效果差。因而本地区进行深层土壤水分估算的最佳表层深度为0～50cm土层,且以经验模型预测为佳。 From April 2005 to January 2006, the soil moisture of 0-180 cm of pear orchard in Yantai Academy of Agricultural Sciences was measured 18 times using Trime soil moisture measuring system. The relationship between the conversion of surface soil moisture and deep soil moisture and the impact of pear tree on the transformation relationship at different growth stages were studied. The results showed that in 0 ~ 10cm and 0 ~ 30cm soil layers, the predictions of deep soil moisture were poor, and the prediction effects of 0 ~ 50cm on deep soil moisture were better, The relative error of the prediction results is more than 12%, accounting for 26.67% and 20.00%, respectively. The maximum relative errors are 21.07% and 15.05% respectively. The prediction accuracy of the empirical model is high and the predictive effect of each model during the growing season is generally Prediction effect during growth and dormancy is poor. Therefore, the optimal surface depth for deep soil moisture estimation in this region is 0 ~ 50cm soil layer, and it is better to predict by empirical model.