The purpose of this thesis is to investigate the lagged effects of financial and monetary policies in Taiwan using relevant literatures and statistic data. Working throughout the Japanese governing period, there are six types of evidence on lagged policy effects that we would like to provide. First of all, we observe the process that Taiwan had evolved from silver standard system to gold standard one. Second, we investigate the intra-regional difference of lending rates and the difference of these rates between Taiwanese and Japanese, respectively. Third, we attend to the setups of the official price of silver coin per unit. Fourth, we compare issuances with circulation of paper bills by Bank of Taiwan. Fifth, we explore the usage of silver coins which has branded by the government. Finally, we discuss both legal-tender reserves and reserves of margin. The above-mentioned results imply that financial and monetary policies had time lags in Taiwan during the Japanese governing period.