Mass　Customization　(　MC)　is　becoming　one　of　the　magi　production　modes　in　the　21(st)　century　as　well　as　Customer　Relationship　Management(CRM)　is　becoming　more　and　more　important.　In　this　paper,　conception　and　classification　of　MC　were　introduced,　based　on　the　importance　of　CRM　to　MC,　demands　of　MC　for　CRM　system　were　analyzed,　and　CRM　for　MC　was　put　forward,　then　the　architecture　of　CRM　system　for　MC　was　built　and　the　modules　in　the　system　were　described.　In　the　end,　key　technologies　of　the　system,　such　as　Web　technology,　data　warehouse　technology　and　process　management　technology,　were　thoroughly　analyzed.