To address the common problems of weak metallic-effect and low stability ofmetallic-effect in existing bonding processes，a two-step bonding process was developed toproduce metallic-effect powder coatings in this work. The original formula was divide into 2parts：the first part is to produce the first-step base powder（rich-resin base powder） byincreasing the content of resin and curing agent and reducing the content of the fillers andother components；the second part is to produce the second-step base powder（less-resin base powder）by reducing the content of resin and curing agent and increase the content of thefillers and other components to maintain the original formula ratio. Metallic pigments werebonding with the rich-resin base powder at 65 ℃（the first-step bonding）， then the products were bonding with the less-resin base powder at 65 ℃（the second-step）. Experimental resultsdemonstrated that this process significantly enhances the metallic stability by regulating themass ratio of resin to curing agent and the bonding conditions. Compared to the control samples （conventional bonding at 65 ℃ twice），the two-step bonding process reduced the average .E of the final films by 26% under varying spraying conditions and increased the metallic area by40% observed under optical microscope，effectively enhancing the metal flash effect. Thisstudy provides valuable optimization insights for improving the bonding process of metallicpowder coatings.