Abstract: The selectivity of tea aphid on fourteen tea cultivars was elevated,and the relationship between Tea Leaf Structure and selectivity of tea aphids on tea germplasms was analyzed.Our results showed that:① Aphid shoot rate(%),aphid number ratio,aphid sentiment index are feasible to measure the selectivity of tea aphid on different cultivars.② Aphid shoot rate(%),aphid number ratio,aphid sentiment index have a strong positive correlation with the stoma density while negative with the thickness of subepidermis,the thickness of cuticular layer on subepidermis,the thickness of palisade tissue of tea leaf,and no significant correlation with the pubescence length and density,the leaf thickness,the thickness of spongy tissue of tea leaf.③ The stoma density,the thickness of subepidermis,the thickness of the cuticular layer on subepidermis,the thickness of palisade tissue is significant factors on the selectivity of tea aphids on tea germplasms.