Liaoning province lies in the east of the Eurasian Continent.It features temperate continental monsoon climate with a long winter, a warm summer and a short spring and autumn. The province receives annual sunlight radiation ranging from 100-200 calories per square cm, and 2100-2600 hours of sunlight with average temperature of 7-11o C. It enjoys 130- 200 days frost free period and 600- 1100 mm of precipitation every year. The annual rainfall is 1100 mm in the east hilly area; while in the west hilly region which is connected with Inner Mongolian plateau, the yearly precipitation is 400 mm. The rainfall in central plain is moderate with about 600 mm per year.