EVALUATION OF CITY INNOVATION CAPABILITY AND THE CONSTRUCTION OF "REGIONAL INNOVATION CIRCLE" IN YANGTZE RIVER DELTA——BASED ON THE FACTOR AND CLUSTER ANALYSIS METHOD
用因子分析和聚类方法评价长三角16个城市的创新能力，构建以杭州、宁波、苏州、南京为中心的四个创新圈，说明分步建设创新圈才能实现区域创新系统整合。
The improvement of regional innovation ability in Yangtze River Delta is depended on the improvement of city innovation ability in each city. Based on the systematic evaluation of 16 cities innovation capability by the application of factor and cluster methods, along with the comparative study of the evaluation result, this paper constructs four Innovation Circle in Yangtze River Delta that is formed by four sub-centre cities (Hangzhou, Ningbo, Suzhou and Nanjing). By the instruction of Trickling﹣Down Effect theory, the study shows that only by the construction of Innovation Circle step by step could the integrate construction of Regional Innovation System in Yangtze River Delta be realized.