Formulations of colored smoke were studied,in which a series of new environment-friendly dyes were used. Experiment results showed that potassium chlorate (KClO₃) and lactose (C₁₂H₂₂O₁₁) are the best oxidizer and the fuel,and 50% red,yellow or blue dye is the optimum content in the primary color formulations. In the synthesis of color 66.6% red and 33.3% blue,50% red and 50% yellow,33.3% blue and 66.6% yellow are the optimums to synthesize purple, orange and green respectively. The non-toxicity dyes used in the study were preliminarily verified through biological experiment.