'evergrow'; Suzhounese: /d͡ʐan¹³ ʐoʔ²³/)[2] is a county-level city under the jurisdiction of Suzhou, Jiangsu province, and is part of the Yangtze River Delta.

It was promoted to seat of a full prefecture in 1295, was rebuilt and fortified in the 14th century, but in 1370 was reduced again to the level of a county.

Changshu has traditionally been a market town for locally produced rice, corn, wheat, tea, and mulberry leaves, and since the 13th century has been a major cotton-producing district.

The city's major industries include textiles, paper-making, fine chemicals, machinery, steel and forestry products.

[5] The China National Highway 204 Yantai-Nantong-Changshu-Shanghai, Sujiahang Expressway and Suzhou-Jiaxing-Hangzhou all pass through Changshu.