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By using the methods of the precise leveling��automatic monitoring��GPS��InSA�ң�optical fiber monitoring and other technical means��the authors made the monitoring studies for the land subsidence in Suzhou-Wuxi-Changzhou area of Jiangsu Province��With the land subsidence in spatio- temporal dynamic evolution��the application effects of various monitoring technologies reflect great differences�� It is necessary to discuss the applicability of different methods��and reliable method system for monitoring ground subsidence must be established�� Summarizing the historical monitoring work��the study analyzed the advantages and disadvantages of different methods�� and proposed for an integrated application system to implement various monitoring methods based on the previous work��