Abstract: In order to study the physiologic varing rule of the fresh fruit of spinous prunus pear the writter of this article had analysed and determined the respiratory intensity, the activity of four kinds of oxidase and the content of V_c, saccharide, organic acids and tannin of the fruit during 1981-1982.The results showed that the following views were noteworthy:1. The fruit belongs to the climacteric type. When the fru i(?)s stored under the temperature of 0℃ to 5℃, the respiratory intensity decreased and the time of keeping fresh prolonged.2. With the progression of the ripeness of fruit the actitvity of the ascorbic acid oxidase, polyphenol oxidase and peroxidase of the fruit decreased, and the content of V_c of the fruit increased. When the ripeness of the fruit reached its peak, the content of V_c got its maximum and then decreased slowly.3. When the fruit got into ripeness the ratio of both saccharide to organic acids and saccharide to tannin reaehed maximum and it was the period that the fruit tasted best.