Abstract: Abstract Core wall rockfill dam is one of the representative types of the Shuibuya Project on the Qingjiang River .For deeply recognizing the reliability of the weathered rock and crushed rock soil used as seepage proof material for the core wall,the field compaction test was conducted.The test results indicated that the weathered shale rocksoil core wall seepage proof is feasible;especially,the seepage proof properties of the mixed material composed of fully weathered rock and strongweathered rock of the upper zones are more reliable.To fulfill the seepage proof demand,the nonuniformity for the upper zone material of strongweathered rock and the mixed quantities,gradations and moisture contents for fully weathered rock should be well controlled ,and be fully compacted.The crushed rock soil possessing good compacting properties in Miaowanggou storage yard is one kind of ideal seepage proof material for core wall.