Seals is an important part of the traditional Chinese paintings. The nondestructive analysis and study of sealink on historical paintings is useful for the identification and archaeological research. But the common test method, such as midinfrared spectroscopy and Raman spectroscopy, are not suited to quantitative analysis and testing of big paintings, which limits their use in sealink research. Nearinfrared (NIR) spectroscopy combine with chemometric data evaluation, which is a developing method, potentially fulfills these requirements. 14kinds of sealink with different colors and date, 5kinds of paper and silk were collected to validate the feasibility of this method. Experiments show that this method not only can identify different kinds of sealink but also can evaluate the similarity between them, which may be used in dating. The appropriate subtracting treatment can remove the interfering signals of paper or silk and keep the precision of discriminant analysis.