Abstract: The paper proposed two different methods to identify the post construction cracks under complex geolog -ical conditions in western Guangdong .These two methods were developed according to geological survey and field monito -ring as well as the different settlement mechanism (the self tightness settlement of filled soils and the consolidation settle-ment of foundation soil) .Crack grouting methods were proposed to repair the different types of cracks .The paper also analyzed the feasibility of the two settlement methods and compared the advantages and disadvantages of the two settle-ment methods .The remedial measures for different types of cracks were introduced in this paper .Finally ,a before-after study was conducted using site monitoring data .The results show that it is reliable and efficient to utilize the two remedial measures to repair different types of the cracks .