Scour is one of the major causes for bridge failure. To prevent this type of failure, it is necessary to detect the scour degree of abutment foundation on existing bridges. As an effective method to estimate scour, the underwater detection technology has been used to estimate the scour degree of abutment foundation of the Zishui bridge of Xiangqian railway in China. And a program was written with MATLAB for the analysis of the effect of scoured area on the piers' stability. On the basis of the analysis, the relationship between the horizontal displacement of pier's top and scoured area was found out with the help of least squares method, The results showed that, compared with other check-calculation items, the horizontal displacement of pier's top and the eccentric distance firstly reached their limit values when a less scour happened.
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