Study on Optimization Strategies of Urban Structure in Ravine Landform — A Case of Yan’an

In Procession of fast Urbanism, At the background of striations of natural condition and land supply shortage, It is the key question which urban size will upgrade and urban structure will change, that Optimizes spatial layout and creates urban features. This paper with case of Yan’an analyses the problem that exists in metropolis spatial layout; then discusses urban planning measures that optimize urban structure to hold compact urban morphology. Finally it sketch out the highlights city "landscape pattern" of the urban space structure optimization strategy.