Abstract: In order to preliminary exploring the effect of chemical treatment before mango bagging,9 kinds of different combination treatment including 4 mango varieties and 5 fungicides were measured by experiments. The results showed that: 47% kasugamycin·copperoxychloride (WP) had better preventive effects on bacterial angular leaf spot and anthracnose disease after mangoes bagging. The addition of difenoconazole·azoxystrobin (SC) or azoxystrobin (SC) to the kasugamycin·copperoxychloride solutions had good results on improving the percent of good fruits bagging, lowering the percent of disease and insect fruits and the percent of pellagra fruits.