This paper introduces the developments of AMS and its applications in China. The AMS at PKU has been upgraded recently and a precision better than 0.5% for 14 C measurement can be reached. Hundreds of samples were dated for the Xia-Shang-Zhou Chronology Project and AMS played an important role in the establishment of chronological framework of those three dynasties. Geological and biomedical studies were also carried out on PKUAMS. AMS at CIAE has measured quite a lot of radionuclides and various detection techniques such as conversed PIXE, gas-filled magnet and gas-filled TOF have been studied. SINR developed an AMS based on a mini-cyclotron and its performance has been improved continuously.