In Ancient Chinese Information Processing, the extraction of entity knowledge is one of the most important studies. Study of digital humanities with entity knowledge should concern more about entity ambiguity for more precise results. The article presents two rule-based methods on entity disambiguation with the ancient Chinese corpus. Two types of entity ambiguity were deeply discussed and two methods with examples of entities in Chunqiu Jingzhuan Yinde were presented. Further research on more ancient Chinese corpus would have shown better understanding of the methods presented above. A visualization study with the data of disambiguated entities was carried out at last and thus showed the value of this study.