Spectral prediction of spot color ink has always been a difficult problem in the field of color research. Color parallel and superposition models was applied to deal with the Clapper-Yule model and to simplify the prediction model of spectral reflectance of spot color ink. Experimental verification showed that the simplified method has a certain practical application value, which can meet the requirement of spot color prediction of general presswork. The simplification can largely reduce the computational difficulty. The accuracy of color parallel model was compared with the superposition model. The result showed that the color superposition model has higher accuracy in simplifying the spectral prediction model of spot color ink.