In the early time of Qing Dynasty, mintage system was quite complex and kept changing from time to time, many had happened only on the weight of coins. Few scholars had noticed that the Qing Government had found the coin of 2 Mace 8 Cds. Based on the files in the First Historical Archives of China, author pointed out the lowness of cost in monetary market was the reason of trial found, and the losing reason was the increase of mintage cost, brought on the loss of mint. In the early time of Qing Dynasty, mintage system was quite complex and kept changing from time to time, many had happened only on the weight of coins. Few scholars had noticed that the Qing Government had found the coin of 2 Mace 8 Cds. Based on the files in the First Historical Archives of China, author pointed out the lowness of cost in monetary market was the reason of trial found, and the losing reason was the increase of mintage cost, brought on the loss of mint.