Abstract: Based on the comprehensive analysis on the anti-freezing test effect during Luochuan apple flowering period, a cost-effective anti-frosting measure under the influence of radiation cooling weather in the Loess Plateau was proposed. The conclusions show that spraying antifreeze and smoke anti-frost make the fruit setting rate doubled, the effect is very obvious, and the cost is low, which is a measure worthy of comprehensive promotion. The air is disturbed and frostproof. Before installing the fan, the local air temperature should be observed to ensure the meteorological conditions are appropriate. Water spray and frost protection and hot air blower anti-frost need electric power guarantee and sufficient water reserve, which is not suitable for large-scale promotion in the Loess Plateau region, and can be suitably applied in small plots with high economic value.

Key words: apple flowering, anti-freezing test, Luochuan county