Abstract: The effects of bagging on fruit quality were studied in pummeloCitrus maxima ( Burm.) Osbeckcv. Malaysia with four different types of bags ( yellow paper bag, white paper bag, white adhesive-bonded bag and blue adhesive-bonded bag) .The results showed that, fruit visual quality and commercial fruit rate of the bagging group was better in comparison with the control group and the yellow paper bag treatment showed obviously advantage in keeping the fruit green than other treatments.The content of soluble solid and vitamin C in fruits treated by four types of bags was higher than the control and the content of soluble solid, vitamin C were the highest the yellow paper bag treatment group.The titratable acids content was not obviously affected by bagging treatment.The effective quantum yield of the fruit treated with four types of bags was prominently increased and the yellow paper bag treatment obviously increased the Y ( II) than other treatment under the same light intensity.According to above results, the yellow paper bag was the most suitable for bagging of Malaysia pummelo fruit.