Monterey Accelerated Research System (MARS) is a main test bed for the deep-sea observatory instruments in the world. On April 14 th, 2011, a China node, which consists of a junction box, a chemical environment system and a dynamical environment system, was  installed on MARS successfully by R/V Western Flyer, R/V Point Lobos and ROV Ventana for long-term test at the seafloor of Monterey Bay. China became the third country who tested her deep-sea observatory instruments on MARS on a large scale. Up to date, China node works well on MARS. The instruments of China node are sending data back from the seafloor of Monterey Bay. China node test on MARS shows that Chinese observatory technologies have had great progresses in the recent four years, which can be applied to the construction of the deep-sea observatory in China. Real-time data from China node will benefit marine research and show great advantages of deep-sea observatory.