As to the brown fade problem during the watermelon juice processing,the color protect method and sterilization skill are studied. The result shows that the optimum process methods is emulsification two times ,stabilization by 1.5‰ agar,1.5‰CMC,1.5‰ fucose,colour protected by 0.00375% EDTA,4min microwave sterilization. The taste of product is good; the color is red and fresh; the appearance is nice.