The universal practices have been centralizing on the research of regularization to the DBIE. The character is elimination of singularities by using the simple solutions. However, up to now the research of regularization to the first kind integral equations for plane potential problems has never been found in previous literatures. The presentation was mainly devoted to the research on the regularization of the singular boundary integral equations with indirect unknowns. A novel view and idea was presented herein, in which the regularized boundary integral equations with indirect unknowns excluding the CPV and HFP integrals were established for the plane potential problems. With some numerical results, it is shown that the better accuracy and higher efficiency, especially on the boundary, can be achieved by the present system.
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