Abstract: In this paper, the summer temperature over the Northeast China, 1881-1978, have been examined by climatic analysis. It is obtained that the heavy low temperature in summer over the Northeast China is a kind of very large scale phenomenon for space and time. The sum of monthly mean temperature for May-September in Changchun may well represent the cold and warm summer over the Northeast China districts. The summer temperature over the Northeast China has obvious stages, it has llo-yr. long period and 3-yr. period. Tf the summer temperature over the Northeast China is low, the heavy damage of agricultural product will be happened. At the cold weather damage year, the heavest damage is done to. growing rice, while sorghum is the next.