When using poetical verses to verify historical facts, people have to examine the value of poems as historical data from angles of time, human affairs and geographical locations.However, the nature of "poetry"tends to determine general historical facts to be obtained more easily and exactly when people use verses to verify them, while particular historical facts are difficult to be verified or are easily wrongly known.People's knowledge of histories may be false in fact if they overstate their verifications by verses.And when people use traditional Chinese literary, philosophical, or even historical books and writings to verify historical facts, the same thing may occur in various degrees.Therefore, it is quite complex and difficult to examine and confirm a historical fact.