Abstract: The paper aims to explore the Variation and effective Characteristics of Pesticides Residue in Oolong Tea，3 different pesticide amount residue Oolong teas which deposited 13 pesticides including organophosphorous pesticide, synthetic pyrethroid pesticide, nicotinic pesticide, acaricide and other 7 kinds of pesticides were prepared by spraying in field trial and made with traditional manufacture process. To study the effects of spraying concentration, background concentration, and pesticide property contribute to dismiss of pesticides in this work, these pesticides were determined in tea leaves and Oolong teas, respectively. The results showed that the amount of pesticides in tea leaves increased with increase of spraying concentration. While their degree of increasing decreased. The amount of pesticides deposited in made teas were lower than tea leaves (about 76%). The degree of dismiss of pesticide was little different among 3 pesticide amount residue tea leaves, but they was evidently different because of their property. Dismiss of Oxadiazine pesticides and Nicotine pesticides were high (39.11% and 47.95%, respectively). However, thiadiazine ketone pesticides and synthetic pyrethroid pesticide were low( 6.55% and 11.05%, respectively). Dismiss of buprofezin was the lowest among these pesticides, while Indoxacarb was the highest. It was conclude that spraying concentration, background concentration, and pesticide property all contribute to the variation of 13 pesticides residue in Oolong tea.