Taiyuan is located in the middle reaches of the Yellow River in North China and is surrounded by hills in its west, north and east. It covers an area of 6998 square kilometers. The Fenhe River , a key tributary of the Yellow River, runs through the territory of Taiyuan City with a long distance of 100 kilometers. Taiyuan lies in the valley basin of both mountains of the Taihang Mountain Ranges in east and the Luliang Mountain in west. It has continental climate in north temperate zone, no bitterly cold days in winter and no broiling hot days in summer, with a quite temperature difference between day and night and a long frost-free period and plenty of sunshine hours in a year.