Abstract: The trend of temperature inversion on fine nights and no-fine nights was discussed. Results indicate that when freezing hazard happens in hilly areas on fine nights, with hoist of relative slope of observation point the temperature difference from the bottom of the slope increases. A regression relation exists between relative slope observation point and temperature difference. Highest temperature inversion appears at the middle of the hill and lowest temperature inversion appears at the bottom of the slope. No significant difference in temperature occurs by changing the relative slope observation point. Fruit trees are not injured by freezing and the lowest temperature is always higher than 0℃. The highest temperature difference is 3.3℃ in fine night. The temperature difference does not change significantly among different slope direction.