Abstract: The MHD angular rate sensor（MHD ARS）with the characteristics of light weight,small size,broad bandwidth is a perfect inertia sensor for space application.In this paper,the principle of MHD ARS and its application in spacecraft are introduced firstly.Then the key technique of MHD ARS is presented secondly.Finally,the paper shows the future of MHD ARS in our aerospace application in the hope of promoting the research of the angular vibration sensor.