The efficient and coordinated development of industrialization, urbanization, informatization and agricultural modernization（so called ＂Sihua Tongbu＂ in China, and hereinafter referred to as ＂four modernizations＂） is not only a practical need but alsoan important strategic direction of integrating urban-rural development and regional development in recent China. This paperevaluated the comprehensive, coupling and coordinated developmental indices of ＂four modernizations＂ of China＇s 343prefecture-level administrative units, and calculated their efficiency of ＂four modernizations＂ in 2001 and 2011. The efficiencyevaluation index system was established. The efficiencies and their changing trend during the period 2001-2011 wereinvestigated using the data envelopment analysis （DEA） model. Spatial-temporal pattern of the efficiency of China＇s prefecture-level units was explored by using exploratory spatial data analysis （ESDA）. Finally, the main influencing factors wererevealed with the aid of geographically weighted regression （GWR） model. Results indicate that the comprehensive, couplingand coordinated developmental indices and efficiency of ＂four modernizations＂ of China＇s prefecture-level administrativeunits have obvious spatial differences and show diverse regional patterns. Overall, the efficiency is relatively low, and onlyfew units with small urban populations and economic scale are in DEA efficiencies. The efficiency changing trends weredecreasing during 2001-2011, with a transfer of high efficiency areas from inland to eastern coastal areas. The differencebetween urban and rural per capita investment in fixed assets boasts the greatest influence on the efficiency.
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