Located in the hinterland of the Songliao Plain in the northeast of China, Changchun City has an altitude of 250m to 350, and its topography is flat and open. Belonging to continental monsoon climate, Changchun is located in the transitional zone between humid region and sub-arid region according to the "National Dry and Wet Climate Zoning". Temperature in Changchun ascends from the east to the west, but precipitation descends. In spring, Changchun is dry and windy, but it is humid, hot, and rainy in summer. When autumn comes, it will get a clear sky and cool weather, whereas its winter is cold and long. And so Changchun is characterized by four distinctive seasons, hot rainy season, and moderate humidity, which offers favorable climate environment for the mankind to tap the nature.