中文摘要：

城市的集聚经济效应作为城市规模与经济效应之间的等价命题,一直都是城市与区域经济学的核心研究任务之一.以辽宁省的14个地级市为研究对象,通过选取适当的指标体系和数学研究方法,并借助计算机软件技术,研究了辽宁省城市规模与经济效应之间的关系.结果表明：城市规模与经济效应之间在时间维度上基本存在线性正相关关系,即城市规模的扩张可以在某种程度上带来经济效应的提升;同时,城市人口密度与第三产业占GDP的比重之间并不存在相关性且无规律可循.因而,在工业化建设浪潮的推动下,不能盲目和无限度地追求城市规模的扩张,特别是城市空间与人口规模的无序扩张.应该在不断做大做强城市产业的前提下,逐步产生扩张城市规模的自然和内在需求,最终寻找城市规模与经济效应之间的最优组合.

英文摘要：

The effect of urban agglomeration economy as an equivalent proposition of the urban size and economic effect,which is always one of a core research task of urban and regional economics. This paper chooses 14 prefecture level cities of Liaoning Province as object of study, through selecting appropriate index system and mathematical research methods, and with the help of computer simulation technology, the results show that a linear correlation exists between urban size and economic effect in the dimension of time,that is the expansion of urban size can lead to the promotion of economic effect. However, the conclusion is not absolute, for example, the paper also comes to conclusion that there is no correlation and regularity between the urban population density and the proportion of the third industry in GDP. Thus,during the tide of industrialization construction,should not pursue the expansion of city size blindly and unlimitedly, especially the disordered expansion of urban space and population size. On the contrary should seek the optimal combination between city size and economic effect in the premise of urban industrial development and producing the natural and intrinsic demands of the expansion of urban size.