Abstract: Frost occurs frequently during florescence and fruit setting phase of Armeniaca vulgaris ×A.sibirica in Baiyushan Mountainous area. In order to prevent frost and postpone florescence, single and double sun shade nets were used to shade trees in the early sp ring before florescence. Compared with no shading, illumination intensity in sunny days was reduced by 56.15% and 87.37% respectively, and 51.33% and 72.05% in cloudy days; surface soil temperature reduced by 3.86℃ and 5.42℃, soil temperature in the depth of 30 cm reduced by 1.01℃ and 1.44℃, air temperature reduced by 1.50℃ and 2.40℃espectively; wind speed decreased 50.00% and 66.67% respectively; air relative humidity increased 15.09% and 20.75% respectively; 0 - 100 cm soil gravimetric water content increased 14.88% and 26.95% respectively;
phenological phase such as florescence, sprouting and others delayed 4 and 5 days, florescence prolonged 1and 2 days, and fruit setting rate increased 7.95 and 10.25 times respectively.

Key words: Apricot, Armeniaca vulgaris ×A. sibirica, Shading net, Microenvironment, Florescence, Fruit setting rate