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Chinese Archaeology The interlock belt of agriculture and husbandry is the transitional area between agriculture area and husbandry zone, therefore, it is necessary to explain the formation of agriculture and husbandry area in order to discuss the formation of the transitional belt. As many archaeologists said, the cooling of the climate is probably the main reason of the formation of husbandry and the cause of its separation from the traditional agriculture. It is also the cause of the formation of interlock belt of agriculture and husbandry in north China. The climate changed cold and dry during the periods between 1500–1000 BC. The north China has experienced a series of changing procedures, from primitive agriculture, to half agriculture and half husbandry, to formation of husbandry and distraction from primitive agriculture, and to interlock belt of agriculture and husbandry. Bases on the changing procedure we could divide north China into three categories–the middle area of Inner Mongolia, the eastern area of inner Mongolia, and Gansu 甘肃 and Qinghai 青海 Provinces. The middle area of Inner Mongolia in 5000 BC was the primitive agricultural area influenced by Yangshao 仰韶 Culture. Although each culture was different in regional source, its implements revealed similar features on the aspects of agricultural civilization. Until 2000 BC, Laohushan 老虎山 Culture has developed into a large-scale primitive agriculture. About 6000 BC, in the eastern area of Inner Mongolia and west of Liaoning 辽宁 Province emerged primitive agriculture, and this agriculture formed Neolithic Hongshan 红山 Culture, including Xinglongwa 兴隆洼 Culture, Zhaobaogou 赵 宝沟 Culture, Fuhe 富河 Culture, Hongshan Culture, Xiaoheyan 小河沿 Culture and the Lower Xiajiadian 夏家店 Culture which belongs to the Bronze Times. The Formation of the Interlock Belt of Agriculture and Husbandry and the Climate Changing in North China