This paper presents multi-criteria decisions support system based on fuzzy AHP for eco-design of a product. The proposed DSS is based on the guidelines given by ISO 14063 standards used in the eco- design of a product. The fuzzy AHP techniques have been applied at relevant steps of product design and development stage of the standard methodology in order to evaluate different tradeoffs related to eco-design strategies. The triangular fuzzy numbers are generated based on the fuzziness of the linguistic variables of the DSS model. In addition to comparing the environmental aspects against the economic aspects, even the social aspects have been considered in this study. The proposed model has been validated with the selected designs of the local traditional brass manufacturing industry in Sri Lanka. The results reveal that the local brass manufacturers should concentrate further on the triple bottom-line of sustainability when developing their designs for eco-manufacturing. Further, this research can be extended to other stages of the standard methodology and as well as to other phases of the life cycle.