Haijian 52 (Chinese: 中国海监 52) is a China Marine Surveillance ship in the 5th Marine Surveillance Flotilla of the East China Sea Fleet. Originally christened as "Shijian" (English: practice, Chinese: 实践) and commissioned in 1967 as a comprehensive oceanic survey vessel, Haijian 52 joined CMS, East China Sea Fleet in 2000. It was planned to be inactive in 2007 but her service was extended.