The history of Yongan as an administrative unit began in 1452, during the reign of the Ming Dynasty. The county was created at the junction of the then-existing counties of Shaxian and Youxi. The name "Yongan" (永安), which can be translated as "Eternal Peace," likely reflected hopes for establishing order and stability in these lands.
Geographical location played a key role in the city's formation. Yongan is situated on the banks of the Sha River, a tributary of the major Min River water artery. This made it a natural transport and trade center on the route through the central part of Fujian Province. Consequently, the city became an important point for collecting and shipping various goods, primarily food and abundant forest resources such as timber.
The 20th century played a special role in Yongan's history. During the Second Sino-Japanese War, after the capture of coastal territories, the Fujian provincial government was evacuated inland. As a result, Yongan became the temporary capital from 1938 to 1945, which significantly raised its status.
Yongan's economic development was closely linked from the beginning to its rich natural resources, especially timber, as the forest cover in this area is one of the densest in southeastern China. Its status as a trade crossroads, due to its riverside location, was the foundation of its early economy. The city's further prosperity and industrial growth were largely tied to the construction of the railway in 1956, which reinforced its importance as a major transportation hub.