Abstract: As an important part of modern urban rail transit planning, metro is one of the methods to rebuild the urban spatial pattern. On the base of the GIS and SPSS statistical software in drawing and regression analysis, this paper establishs the matrix of time accessibility to calculate the time accessibility’s coefficient of metro. Moreover, it analyzes the impact of metro of line 1 to line 5 on spatial structure of Fuzhou’s main urban area from three aspects , which are the urban spatial scale, the urban center system and the urban function layout. There are three main conclusions in this paper. At first, the result shows that Fuzhou urban spatial scale will amplify after the completion of the metro, and the direction of urban morphology expands to the south and the east. What’s more, there will form five level ranking areas of spatial difference. Secondly, Fuzhou metro will play a key role of urban spatial structure pattern, which strengthens the concentric structure mode of urban. But the center of main urban area will transfer moderately. Thirdly, Fuzhou metro has an essential impact on the urban spatial function layout. The urban commercial layout will form different levels of commercial area by the influence of the metro hub site. But the impact on the layout of residential function is relatively weak, which needs to refer to more variable factors.