Abstract: Contentsof MDA in mango peel went up continuously under fluoride pollution, and it's SOD, CAT, POXenzyme activities increased in initiative developmental stage and reached a climax in 33days after flower shedding and descended rapidly later. As a result, black tip symptomswere appeared. Fruit bagging was a physical measure to isolate fluoride pollution andearly bagging pulled the enzyme activities back to normal level so mango fruit coulddeveloped normally; However, fruit bagged in late period, enzyme activities weredisordered and black tip symptoms appeared. Harmful ethylene in mango fruit was excretedin 33 days after flower shedding and fruit black tip symptoms appeared heavy when fruitexposed under fluoride pollution. Black tip symptoms can be reduced effectively bydecreasing the contents of harmful ethylene via fruit bagging before 33 days after flowershedding.