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Being the unique stage to face client, the "Last Mile" in e-commerce logistics is the bottleneck of ecommerce development owing to the problems of high cost and low service quality. The author attempts to analyze the delivery patterns of "Last Mile" on the basis of economics and find the appropriate model of delivery for the "Last Mile". The author uses PRN analysis framework to describe the product, resource and network economy of the "Last Mile" based on the deep analysis of various patterns of delivery of the "Last Mile", the emphasis of this paper is analyzing the effect of three new patterns of delivery, which focuses on the economies of scale, economies of scope together with saving the cost of time and space. It puts forward to build a comprehensive model of delivery consisted of socialized third-party logistics, intelligent pickup cabinets, express-collections offered by convenience stores, supplemented by self-built branches, and door-todoor delivery service by couriers, so that not only the allocation of resources in domestic e-commerce logistics should be optimized, the cost also needs to be lowered as much as possible. Keywords-the "Last Mile"; delivery pattern; space and time; economies of scale; economies of scope I.

Based on the panel data of 16 cities between 2003 and 2018 in China City Statistical Yearbook, this paper analyses the current situation and the influencing factors of Producer Services Agglomeration in the Yangtze River Delta. The research adopts spatial econometric methods with spatial weight matrix. The empirical result shows that the agglomeration trend of producer services in Yangtze River Delta is obvious, and the spatial agglomeration pattern is gradually formed. Opening degree and human capital have positive impacts on producer services agglomeration. The agglomeration is negative. And city scale has no effect on the agglomeration. At last, the paper puts forward some suggestions to improve the level of producer services agglomeration in the Yangtze River Delta.