Abstract: The paper outlines two routes to digital pattern design for customized garment: pattern design technology of 2-D CAD system and flattening technology based on 3-D garment model,presents their principle,applications,advantages and disadvantages.The former technolgy include three methods: pattern altering based on grading technique,pattern auto-making based on parametric design and pattern generating based on artificial intelligence.The latter technology include three methods: geometric flattening,mechanical flattening and geometric flattening-mechanical amendment.