Abstract: 【Objective】 To obtain the cold resistance of different flower organs and analyze the semi-lethal temperature of flower organs of 9 varieties by testing the physiological and biochemical indexes of flower organs of 9 apricot varieties in the hope of providing a basis for the selection of cold-resistant cultivation varieties and cold-resistant breeding. 【Methods】 The electrical conductivity of the flower organs, the physiological and biochemical indicators of SOD and POD were tested, and then the test data were analyzed with Excel table and DPS software. 【Results】 The sort of semi-fatal temperatures for pistils, stamens, and petals from high to low was petals> stamens> pistils; the rating from high to low of the semi-fatal temperatures for pistils, stamens, and petals of different varieties were Prunus amygdalus Batsch > Armeniaca vulgaris Lam > Armeniaca vulgaris Lam > Prunus armemiaca > Armeniaca vulgaris Lam > Prunus armeniaca L > Prunus armeniaca L > Prunus armemiaca > Prunus armeniaca; Through the analysis results of frost damage on flower buds and flowers under different low temperature treatments, the sorts from high to low of the semi-fatal temperature of flower buds and flowers were flower buds > flowers; At the same time, it was also shown that, in different varieties of apricot flowers, the sort from high to low of the semi-lethal temperature of the opened flower organs, flower buds, and flowers was Prunus amygdalus Batsch > Armeniaca vulgaris Lam > Armeniaca vulgaris Lam > Prunus armemiaca > Armeniaca vulgaris Lam > Prunus armeniaca L > Prunus-armeniaca-L > Prunus armemiaca > Prunus armeniaca; the SOD activity of the flower tissues of different varieties changed from high to low. As the treatment temperature increased from high to low, the SOD activity values of each variety of pistils, stamens, and petals showed the tendency from low to high, the peak of the temperature of the pistils and stamens was -1℃, and the temperature of SOD peak for the petals was -5℃, except for the three varieties of Prunus amygdalus Batsch、 Armeniaca vulgaris Lam, Armeniaca vulgaris Lam, which was still in an upward process. And those of the rest of the varieties were between -1 and -3℃; the POD activity of different apricot varieties changed. With treatment temperatures of 0, -1, -3 and -5℃ from high to low, the SOD activity values of each variety of pistils, stamens, and petals showed a process from low to high. The SOD activity values for pistils and stamens showed a process from low to high, then to low, the temperature of SOD peak varies according to the cold resistance of different varieties, the temperature of SOD peak of Prunus amygdalus Batsch, Armeniaca vulgaris Lam, and Armeniaca vulgaris Lam, Prunus armemiaca, Armeniaca vulgaris Lam was -3 ℃, the temperature of SOD peak of Prunus armeniaca L, Prunus armemiaca and Prunus armeniaca was -1℃. The temperature of SOD peak for the petals was -5℃, except for the varieties of Prunus amygdalus Batsch, Armeniaca vulgaris Lam, Armeniaca vulgaris Lam, Prunus armemiaca, which was still in an upward process. And the high values of the rest varieties were between -1℃-3℃. 【Conclusion】 The sort of the cold resistance of the nine varieties of floral organs is Prunus amygdalus Batsch > Armeniaca vulgaris Lam > Armeniaca vulgaris Lam > Prunus armemiaca > Armeniaca vulgaris Lam > Prunus armeniaca L > Prunus armeniaca L > Prunus armemiaca > Prunus armeniaca. In the frost year, the actual frost damage results of each variety are basically consistent with physiological test analysis.