Targeting on optimizing green performance of configurable product, taking environment performance into consideration of product configuration design, a green design oriented product optimizing configuration method was given based on product family function-structure mapping. The quantified analysis was given to green performance of product family inner structure unit from four aspects: disassembly performance, recycle performance, lifespan and environmental influence. On the foundation of standardizing quantified results, targeting on the optimized green performance of configurable product, an optimized mathematic model was established and the corresponding algorithm was given. Finally, the configuration and design of spindle box of a vertical milling machine was exemplified to validate the method.  