Abstract: Based on the result from teak provenance trial there are significant differences in drought resistance among the provenances, the morphological and anatomical structures and the mechanism of drought resistance were further studied. It has been found that there are highly significant differences in major morphological and anatomical characters of lamina and petiole among the provenances. This result is in accord with that of field investigation of drought resistance. The sequence of xerophilous capability of the provenances is 30723070the other provenances tested. The xerophilous mechanism is caused by joint effect of some morphological and anatomical characters including the increase of water utilization effeciency and decrease of water consumption and loss within the plant. It is incorrect that only stoma density and stomatic chamber size are used as xerophilous indexes. The thickness and area of the lamina and their ratio, the cuticular cell layers of the lamina hypodermis, the quantity and structure of vascular bundles in the petiole can be used as the indexes of xerophilous breeding and prediction of drought resistance at early stage.