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The experiment were settled in the county of GUIYANG, HUNAN. Irrigating during maturation stage, the test was measured the soil water of different soil horizons and analyzed the effect of middle-upper leaves on agriculture character, physical characteristics, chemical component, neutral aroma components, sensory quality,and so on. The objective was to solve the negative of drought during maturation stage.After irrigation during maturation stage, the0-20cm soil water keep on the suitable level as the irrigation time was put off and the times increased. And in this condition,20-40cm soil water changed little and maintain on a certain level. After irrigation during maturation stage, the plant grew well and the upper leaves increased but the length, the quantity of leaves were different.After irrigation during maturation stage, physical characteristics of the upper leaves got better, the length, width and area increased trend, but the leaf weight of unit leaf area and stem ratio decreased, and the difference did in a significant level. The leaf weight and the area increased and the leaf weight of unit leaf area decreased as the irrigation times increased.After irrigation during maturation stage, the total nitrogen and nicotine were with a downward tendency, but reducing sugar and total sugar increased, so did NIT/NIC, SUR/NIC, K/CL, SUR/SUT. That was better to enhance the harmony of chemical component.Under the condition, the component of chromoplast pigment products, browning reaction products and other aroma components increased but the phenylalanine degradation products decreased, and the cemdrenoid degradation products did not have obvious rule. The neophytadiene of flue-cured tobacco increased as the irrigation times added but the products of benzy furan and2-pyrrole acety groups did not.After irrigation during maturation stage, the tobacco had better aroma quality, moderate taste. The sensory evaluation, the yield and production value increased as the times added, so did the sensory evaluation, first and middle-class tobacco, economic benefit, especially irrigating on squaring and topping stage.To sum up, irrigating during maturation stage had a positive effect on the soil water, plant growing and quality of flue-cured tobacco, especially irrigating on squaring and topping stage.
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