With the continuous unearthing of materials in Khitan large and small scripts and the unremitting efforts of experts and scholars, the study on Khitan scripts has made considerable progress. Through combing the existing literature in Khitan large script, and referring to the relevant Chinese epitaphs and materials in Khitan small script. The author, on the basis of previous studies, makes a research on Khitan large script of cardinal numeral, negative modal particle and participial suffixs etc.