Takao Prefecture
In 1895, the Qing dynasty ceded Taiwan to Japan in the Treaty of Shimonoseki after losing the First Sino-Japanese War, and Siaogang was used to produce sugar for Japanese. In 1920, the original name of "Kang-a-ki" () was changed, and the incorporated areas were administered as under Hōzan District, Takao Prefecture. As a heavy industry base in Taiwan during World War II, Siaogang was more heavily bombed by the Allied force than other parts of the city.