In order to study the characteristic of forest fires and the relationship between forest fires and the key climate factors,and provide theoretical basis for forest fire prevention under the background of climate warming, trend analysis and correlation analysis are used in the study,annual mean moisture coefficient,annual mean wind speed,and annual mean daily temperature range are analyzed as meteorological index,the number of forest fires and the forest fire-burnt area are analyzed as forest fire index. The relationship between forest fires and the key climate factors are studied from 1954 to 2013 in Shaanxi,the northern part of Shaanxi,the central region of Shaanxi,and the southern part of Shaanxi. The results show that,the number of forest fires and the forest fire-burnt area decreased in inverse curve way with the time series. Forest fires occurred frequently in the 1950s to the early 1960s,reduced and stabilized since the 1990s. There were forest fires in every month,and 89.3% of the forest fire-burnt area occurred in January,February,March,April and May. Most of the forest fires especially the bigger fires happened at 10-12 am and 13-16 pm in every day. Forest fires appeared apparent geographical features in Shaanxi province. Annual mean moisture coefficient and annual mean daily temperature range showed a downward trend,while annual mean wind speed increased since the beginning of the 21th century. Impact of climate factors on forest fires performed regional and lagging features. Annual mean moisture coefficient,annual mean wind speed, and annual mean daily temperature range all showed positive correlation to forest fires in the same year. Now forest fires in Shaanxi reduced and stabilized at a low level,the risk of forest fire will aggravate in the future under the background of climate warming.