中国中医研究院西苑医院等运用计算机图像处理技术，结合中医舌诊相关理论研制出“中医舌诊专家系统”，实现了舌诊的定量分析。我们应用该系统，对927例患者舌质舌苔定量观察，探讨舌诊定量变化规律，结果表明，各类舌质舌苔有相应的RGB（R为红色，G为绿色，B为蓝色）数量特征（P<0.01）;舌苔RGB值不仅与舌苔颜色密切相关，而且和舌苔的厚薄、腐腻等变化明显相关；舌苔面积百分数基本上反映了舌苔的覆盖面积。因此，应用中医舌诊专家系统对舌质舌苔进行量化诊断，可为中医辨证提供客观依据。

Xiyuan Hospital of China Academy for TCM, cooperated with other units, on the basis of making use of computer image technology and combining TCM theory of tongue inspection, developed the expert system of tongue inspection of TCM and accomplished the quantitative analysis of tongue inspection. The system was used in quantification study on the tongue body and tongue coating for 927 patients. The results showed that each kind of tongue body and tongue coating had its corresponding quantitative RGB (three basic color, R is redness, G is greenness, B is blueness) characteristic. RGB value of tongue coating is related not only to the color, but also the thickness, curdy appearance, greasinessl of tongue fur and so on significantly. RGB value between different tongue fur is different significantly. The percentage of tongue coating area can basically reflect the tongue coating covering area. Therefore, the application of tongue inspection of TCM on the quantificational diagnosis of the tongue body and tongue coating can provide objective references for clinic of TCM.