Consistency　maintenance　and　coordination　are　key　issues　in　collaborative　design.　Aiming　at　the　characteristics　of　multiple　views　and　dynamic　nature　for　multidisciplinary　collaborative　product　design,　a　dynamic　coordination　principle　and　method　were　introduced.　The　main　idea　was　when　one　discipline　dynamically　added　or　deleted　some　components　in　the　discipline　view　model　itself　according　to　its　demands,　other　disciplines　would　respond　through　a　mechanism　based　on　semantic　reasoning　about　the　components＇　functions　and　automatically　update　their　discipline　view　models,　and　then　the　dynamic　coordination　among　the　multiple　discipline　view　models　was　achieved　in　the　collaborative　design　process.　Using　JSP,　JavaBean,　Drools,　Ajax　and　other　related　techniques,　a　prototype　system　was　developed,　and　a　reducer　was　illustrated　to　validate　the　proposed　principle　and　the　method.