This paper presents the data mining application in the civil engineering deformation measurement. The data mining process is described based on a case study. This case is about deformation of residence buildings caused by one of Shanghai tunnel constructions in the vicinity of these buildings. The steps of data cleaning, data Integration, data mining, model assessment, and analysis results expression are given in detail according to the specific condition in the case. The findings in this article provide reference for deformation measuring data analysis, especially for the situation which limited measuring network or relative unstable region.