Abstract: By using the data of temperature,frost-free period and the cumulative temperature of the period that temperature higher than 10℃ of Wulanhaote city during 1951-2006,the variation of heat resource in recent 56 years was analyzed.The results showed that heat resource increased,especially since 1990s.The average annual temperature and average seasonal temperature increased obviously.The growth period of crops was prolonged obviously by the increase of heat resource,which was beneficial to grow high-yielding plant in the late-maturing varieties of maize and other crops.However,the increase of heat resource exacerbated the city's high-temperature hot summer extent and increased energy consumption.

Key words: Temperature, Frost-free period, Active accumulated temperature, Agricultural production, Ecological environment