Abstract: Research on MCCAD includes formulation of printing color standards, a model transformation between screen reproduction and printing restoration, an expert color design system and etc. On the basis of chromatic theory, this paper depends on an experimental method to analyse the chromaticity data and range of a CMY printing color system and a RGB screen color system. This paper also sets up a new model whose range of usage and color conversion is wider than that of CRT, PAL and NTSC color models. The new model solves the crucial techniques concerning screen reproduction of map printing color, establishes a data base of a map chromaatogram and introduces a CAD method of the color map. Technical means is provided for map color CAD, printing technology digization and standardization design.