24MN anchor chain tensile testing machine the largest and the most modernized in China was successfully debugged in Zhengmao Group Co., Ltd , and was formally put into service on Jun. 1st, 2002. It was the biggest technologically-renovated investment in 2002, with a total sum of RMB 4 million. 20MN tensile machine was carried out with disassembly, assembly and reelection for two and half months, and was put into use after being tested qualified by Jiangsu Institute of Measurement and Testing Technology, creating conditions for production of large-size long mooring chains in the future.