Abstract: An experiment was performed to investigate the effect of organic fertilizer and bagging on fruit flavor quality of Yali Pear. The effect of organic fertilizer and bagging on the ingredients and contents of volatile compound, sugar and organic acid in Yali pear fruits were bagged and used organic fertilizer in growing were studied, using static headspace and gas chromatographymass spectrometry (GC-MS) and highperformance liquid chromatography (HPLC). The thirty different ingredients of volatiles were detected in Yali pear fruit, including 26 esters, 3 alkenes and 1 alcohol. Organic fertilizer increased but bagging decreased the ingredients and the contents of volatiles in Yali pear fruit. In comparison with compound fertilizer, organic fertilizer increased 8 and 6 volatile ingredients of bagged and not bagged Yali pear fruit, respectively, and increased the contents of volatiles by 182.89% and 127.16% in bagged and unbagged Yali pear fruit, respectively. Bagging reduced 8 and 10 volatile ingredientsin organic fertilizer and compound fertilizertreated Yali pear fruit, respectively, and reduced the contents of volatiles by 66.32% and 72.96% in organic fertilizerand compound fertilizertreated Yali pear fruit, respectively. Four sugar ingredients with fructose being the dominating followed by sucrose, sorbitol and glucose and 7 organic acids with malic acid being the most aboudent followed by acetic, citric，shikimic acid, quinic acid，tartaric acid，succinic acid were detected in Yali pear fruit. Organic fertilizer increased but bagging decreased the contents of sugars and organic acids. Organic fertilizer increased but bagging decreased the ingredients and the contents of volatiles in Yali pear fruit. Organic fertilizer increased but bagging decreased the contents of sugars and organic acids in Yali pear fruit.