The　capital　market　is　Complex　Adaptive　System.　As　for　the　complexity　of　the　capital　market,　some　of　our　most　powerful　mathematical　tools　are　of　limited　help　in　understanding　the　development　of　CAS.　This　paper　suggests　ways　to　modify　research　methods　and　tools,　with　an　emphasis　on　the　role　of　computer-based　models,　to　increase　our　understanding　of　CAS.　People　introduce　the　conception　of　Agent,　and　in　the　capital　market　the　Agent　is　the　investor.　The　author　discusses　the　modeling　for　trading　process　of　agent-based　capital　market　from　two　respects:　the　first　one　is　the　whole　market　mechanism,　discussing　the　trading　model　of　ZIP　traders　in　CDA　market;　the　other　is　the　process　of　decision-making　of　every　Agent,　discussing　the　decision-making　model　based　on　the　Supergame　analysis　theory.