Based on the 46 observation station' s data of precipitation and temperature over the northeast area of China from 1955 to 2004, the 5-day sliding average method was used to determine boundary date of ≥10℃, and accumulated temperature within boundary date was calculated , moreover, the ratio of accumulated temperature and precipitation in the same period were used to represent dryness. The spatial and temporal distribution and variation tendency of the surface dry and wet status over the northeast China were analyzed. The results showed that the wet conditions in northeast China had obvious spatial and temporal variation characteristics, overall, there were drying trend in northeast China in recent 50 years.%利用1955～2004年我国东北地区46个测站降水和气温资料,通过5日滑动平均法,确定≥10℃的界限日期,并计算界限时期内的积温值,用积温值与同一时期的降水量的比值表示干燥度,分析了东北地区每10年干湿状况的时空分布规律及变化趋势.结果表明,东北地区的干湿状况具有明显的时空变化特征,总体而言,东北地区近50年干湿状况呈变干的趋势.
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