Based on the reduction of silver supply and the rising exchange rate of silver with respect to copper coins, many studies believe that silver crises/currency crises did occur in China in the first half of the nineteenth century. In addition, they argue that both the Opium War and the Taiping Rebellion were highly related to these crises. However, Chinese private bills and silver coins should have been in wide circulation in the early nineteenth century. It seems that there is inadequate evidence to support the thesis that silver crises had actually taken place in China judging from the stock/flow of the broadly-defined silver currency. The author therefore considers that shortage of land, political corruption, opium imports (trade disputes) or the unequal relationship between China and Britain were actually the primary causes for the Opium War and the Taiping Rebellion.