Abstract: The statistics of Nan'an City about land use and the tertiary industry outputs from 2001 to 2010 were used to analyze the industrial structure, land use structure, land use efficiency and their correlation. Results showed that Nan'an City was in middle-phase of industrialization, land use structure had strong correlation with industrial structure on the basis of a Pearson Correlation Analysis, and land was transformed continuously from agriculture and the unused into construction. GDP per unit land area remained very low but rose 20.25% annually. The declining trend of land use efficiency was explained by the coefficient value of agricultural land-output structure, rising sharply from 8.27 to 18.50, and the efficiency of non-agricultural land rose slightly. Finally, policies were suggested for Nan'an City to upgrade industrial structure and optimize land allocation.