During the Qing Dynasty, the depth of Lukang's harbour and its proximity to Fujian province on mainland China made Lukang an important trading port. During Lukang's heyday from 1785 to 1845, Lukang's population reached 200,000. Lukang was Taiwan's second largest city after current Tainan and was larger than Bangka (now a district of Taipei), then the island's third-largest city.
The subsequent silting of the harbour and the city's refusal to allow railroads to pass through the city led to losses in trade in commerce, which, in turn led to Lukang's decline. This same decline, however, averted the modernization processes that demolished historical buildings in Tainan and Taipei, leaving Lukang preserved as it was in its heyday
