In order to satisfy the requirement of new mining method for the fitted drilling equipment, the author and his colleagues must develop an advanced multifunctional rotary drill suitable for China's mines,on the after new trends of science and technology overseas. Therefore, model KYZ-200 ro-tarydrill came into being for this purpose. This drill serves the functions of boring and reaming. The replacement of a few parts in the drill can satisfy the requirement of drilling the varied diameter holes. The cylindrical frame, dual-regulating lever and anchor prop on the drill have a stayle of their nwn design. The hydraulic system incorporates rotation, advancement and rapid advancement, with the rational arrangement, compact structure and good adaptability. The design features, working prindiple, the results of application, and consumer and expert assessment are introduced in this paper.