Abstract: Frost injury during the florescence is one of the most serious meteorological disasters affecting the production and quality of apple. In temperate regions, effects of frost damage on deciduous fruit trees during florescence exceed effects of winter freeze. The risk of frost injury in the apple florescence depends on the developmental stage and disaster-causing factors. The minimum temperatures or frost days are usually adopted as disaster-causing factors, but single index cannot reflect combined effects of meteorological factors on frost injury.The disaster exposure index and the dominant disaster-causing factors are determined based on the geographical distribution of frost injury during the apple florescence, meteorological data, together with the maximum entropy (MaxEnt) model and ArcGIS spatial analysis technique. An assessment is carried out on the main cultivated area using meteorological data from 2084 meteorological stations during 1981-2013. Results indicate that the frost injury occurs when the effective accumulated temperature (daily maximum air temperature is no less than 6℃) reaches 420-550℃·d before flower-beginning. The dominant disaster-causing factors and their thresholds to the frost injury in influence descending order are listed as follows: The maximum diurnal range of temperature (no less than 22℃), the extreme minimum temperature (no more than-2℃), the precipitation (no more than 5 mm) and the accumulated daily minimum temperature below 0℃ (no more than-14℃·d) in processes of strong cold air. The higher risk areas include northern Xinjiang, western and northern Loess Plateau, especially the plateau area of the western Sichuan, while risks in areas around the Bohai Bay and the Old Course of the Yellow River are lower. The distribution of risk areas are related with the apple phenophase and routes of cold air. The disaster affected degree also varies according to different cultivars.