From 1960’,several groups of coin patterns have been unearthed at Wancheng site in Nanyang,which reflect the development of the casting coin technique at Nanyang county of Han dynasty.

However,the time of census register and money casting bureau are the 2nd year and the time of salt industry is the 1st or 2nd year of Yuanfeng.

The Qianlü of Han bamboo slips reflex two systems of accusation and punishment for being related or friendly with somebody who has been convicted of an offense in pirated coinage of Han dynasty.

In Song dynasty,copper cash casting develops gradually and reachs prosperity during xining and yuan feng period,after this,takes on the trend of declining;the cost of copper cash casting rises gradually owing to rising Price in sPite of feudal official s efforts.