Three-dimensional finite element analysis of left dam abutment seepage is carried out based on a proposed earth dam in order to study the bypass seepage law of deep and thick sand layer.

This paper analyzes the main reasons of the generation of the leakage of the concrete dam(including the leakage on dam body, the leakage on dam base, and the leakage around dam), and according to the leakage on different parts, puts forward some corresponding patching measures.