There are many allographs in Sui Tang and 5-Dynasty periods Carved stone Regular script character.This paper is a corpus-based study which chooses and analyzes 9874 allographs extracted from the corpus of Sui Tang and 5-Dynasty periods Carved stone Regular script character for the exploration of its general features.It indicates that, the primary reason of character variation is the variation of the component; the second reason is the variation of the stroke; a distinguishing feature of the allograph is generalizability.