For the seepage failure of sility channel bank slope due to continuous rainfall,the measures of inverted filter and seepage-proofing wall are usually adopted.In view of a channel bank works in north area of Jiangsu,the prestressed concrete pile wall is proposed to be a seepage-proofing wall measure,and the application effect of seepage-proofing wall in different positions is analyzed numerically.The results show that when the pile seepage-proofing wall is set in some distance behind bank retaining wall and in some depth into soil,the seepage path is effectively extended and the slope displacement caused by rainfall infiltration is substantially reduced,so the bank stability is guaranteed.