Abstract: The steering radius of roadheader has a great infulence on the steering performance in tunnel, so it is of great significance to analyze and investigate the steering radius of roadheader. In this paper, based on the present steering radius model of track, a new computational model of steering radius of roadheader is proposed, in which boundary dimension of roadheader, horizontal swing of cutting arm and steering radius of track are taken into account. And then, the influences of track steering radius and horizontal swing of cutting arm on steering radius of roadheader are analyzed and obtained, the research results provide a reference base for the design of roadheader and assessment of steering.