The Yangtze River Economic Belt has become a national strategy, and regional coordination should be enhanced. Based on the enterprise association network, this paper aims to measure the connectivity of cities, using the correlation data of 100 top enterprises and their branches. The results show that: the regional coordination level between the central city and others cities presents 'low-high-low' or 'strong-strong-low' as the distance increases. At the province scale, the level is much higher than that at the urban agglomeration scale. In the Wuhan metropolitan area, the urban agglomeration around 'Changsha-Zhuzhou-Xiangtan' and the urban agglomeration around Poyang Lake, urban agglomeration around 'Changsha-Zhuzhou-Xiangtan' get the highest level of regional coordination. In the urban agglomeration of the middle reaches of the Yangtze River, administrative regional economy seems to be a prevalent phenomenon. The administrative boundary imposes restrictions on the improvement of regional coordination.%在长江经济带成为国家战略的背景下,长江中游城市群的区域协作有待加强.基于企业关联网络,利用百强企业分支机构之间的关联数据,通过"总部—支部法"进行关联度测算,发现在长江中游区域的"城市圈"、省域、长江中游城市群3个尺度上,中心城市与周边城市的联系呈现出"弱—强—弱"或"强—强—弱"的变化规律,在省域尺度上区域协作水平高,在长江中游城市群尺度上区域协作水平下降明显;在武汉城市圈、环长株潭城市群、环鄱阳湖生态城市群中,环长株潭城市群区域协作水平最高,武汉城市圈和环鄱阳湖生态城市群次之.同时,长江中游城市群内"省域经济"的特征较明显,"省级行政边界"对企业分支机构选址行为有较大影响,从而对所在区域协作水平影响显著.
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