The delimitation of Chinese ancient history, which have been researched for a few generations, is a great accomplishment for Chinese historians by using Marxism to study historyWith today s difficult position, some scholars hold that this question is indeed a false question, for it is a production of ideology and analysing Chinese history with Europe history model.

In this article,the way to establish the database of prohibited azo dyes was discussed in detail,by using the database reduced the test time,improved the test veracity,avoid false positive problem during test.