At the start of Canh Hung dynasty, various types of coins were minted. The materials for coining include bronze, zinc and mixed metals. In terms of coin titles (four characters on the coin), there are different ways of writing: simple, seal style, jotting, stylised characters... The coin diameters in previous periods had been just 23mm-24mm, but in Canh Hung period, they were 35mm-50mm. In terms of appearance: Previously, the coin backs had been left plain, in Canh Hung period the coin back included the year, the place of coining or a dragon image in relief. Apart from "Thong bao", "Nguyen bao", there were 14 other coin titles. After the study of the 14 titles, the author presents some problems for discussing about the relationship between the titles and the raised characters on the coin backs and the prevalence of some coin types; whether the populous development of coins in the South was a factor which forced the North to search for the way to make Canh Hung coins "prosper"?