Since the 1980’s,climate in Heilongjiang is obviously warming. And therefore extreme weather events occurred: such as ①increasing heavy rain events; ② days with extreme maximum temperature above 30℃ decreased; ③ below -30℃ extreme minimum temperature mean days obviously decreased; ④ the first frost date has prolonged for 2—5 days; ⑤ The last frost date in the north and middle comes 3—5 days earlier,while in the south it prolonged; ⑥ In summer,the low temperature days decreased obviously,the north decreased more than the south; ⑦ The heavy drought years increased,the flood number decreased in the north and increased in the south. The southwest regions was sensitive to the drought/flood.