With the development of information technology,the underwater deep cement mixing（DCM） pile construction ship has a perfect automation and information control system,which records a lot of data in the process of construction.At present,most of the analysis of cement soil’s influencing factors are based on the experiments in laboratory,or the design parameters and test results of the project (i.e.,the construction parameters are consistent with the design parameters).However,the actual construction conditions are not consistent with the laboratory conditions,and the actual construction parameters are also different from the design parameters.Based on the real-time data recorded in the construction process of the underwater DCM pile in the Hong Kong International Airport Third Runway Project and the statistical parameters of the tested piles during construction,and combining with the investigation and geotechnical test results,we establish the causal relationship between the investigation,construction and tests.Through the statistical analysis of the main factors that affect the quality of pile forming in different depth of different soil,we provide the basis for the actual construction parameter control.