In order to study the influence of laser processing parameters on the resulting color and a possible connection of laser parameters, the heating process of the stainless steel in laser marking are simulated based on the analytical results of temperature fields generated by nanosecond laser pulse marking on the surface of stainless steel. Experimental results indicate the reasonability of the heat analysis in this study. It is found that the influence of laser process parameters on the resulting color are based on heat treatment, so the same color can be produced by different sets of parameters. Besides, different types of heat input are changed by various laser parameters, which produce different heat treatments. Accordingly, some colors can be marked only by specific sets of laser parameters.