The proportion of carbon emissions in packaging industry has exceeded its proportion of output value in GDP, in order to reduce highly waste and carbon emissions in the life cycle of product packaging, a conceptual design processes and method of low-carbon packaging of products was provided, the guideline and boundary of conceptual design for low-carbon packaging was discussed. Under the constraint of comprehensive optimization which integrated protection, merchantability, low-carbon and economy, the principal component model of conceptual design parameters for low-carbon packaging was analyzed, its effective to reduce dimensions of design parameters by mathematical way, the new principal component which integrated and filtered original design information and reduced the difficulty of design; the carbon footprint calculation model of the conceptual design phase of product packaging was also discussed; the method of evaluation and selection on conceptual design scenario for low-carbon packaging was established. The case study results of gasoline packaging show this method is effective through three scenarios including wood, corrugated cardboard and plywood in the low-carbon packaging concept design guidance, and the corrugated cardboard is determined to be the best solution because of its comprehensive performance indicators: 161.17. This result consistent with packaging trend of mechanical and electrical product which use high-strength corrugated cardboard instead of wood．