Abstract: Wide range late frost is a complex process, affected by strong cold air flow, intense radiation cooling and other factors, causing a lot of difficulties to prevent and control it. On the basis of traditional Chinese frost prevention technology (according to the weather forecast or experience of weather and fuel fumes), the authors invented an instrument that could forecast the temperature accurately (±0.1℃) and chemical fuel block that could arise temperature to prevent frost. The authors used Chinese utility model patent (ZL2006 2 0128137.6) portable automatic frost prevention alarming device for the field temperature monitoring and alarm, and Chinese invention patent (ZL2013 1 0003313.8) products (sawdust fuel block and briquette burning) to improve orchard temperature in the frost day. The results showed that: the operation of the alarming device probes was stable, and could measure the temperature of the apricot continuously and accurately. The composite fuel block would release a large amount of smoke and reduce visibility; 240 fuel points/hm² could improve apricot orchard temperature by 1.53-2.15℃, and 375 fuel points/hm² could improve apricot orchard temperature by 3.10-4.40℃, significantly reduced the freezing rate of the flower, and thus effectively prevented frost damage.