During a long time in the past, the treatment of well point has been a difficulty in academia. However well pumping is still inevitable in civil engineering circles due to its effective role on groundwater control. Firstly, the currently available treatment methods of well point are summarized. Through comparison between these existing methods and theoretical analysis, a drainage substructure is advanced, of which the inner layer is a square having equal perimeter with the actual well pipe. Results of numerical simulation upon a field pumping test prove the effectiveness and feasibility of proposed drainage substructure method, which may contribute to the well point simplification in future research.