In recent years, the MPD technology sees a rapid development both at home and abroad because it can effectively reduce the downhole troubles and accidents, reduce the non-productive time, and is very suitable for the complex formation drilling operation during the oilfield development. Currently, the constant bottom hole pressure managed pressure drilling (CBHP MPD) is the most commonly used managed pressure drilling technique, covering more than 80% of the total usage. The paper analyzes first the scope of the applications, the advantages and the key technologies of CBHP MPD, and then the current solution and the technical status, including the back pressure pump and the choke control method, the continuous circulating system (CCS) control method, the continuous cycle valve (CCV), the injecting gas stable pressure and the fully automatic intelligent managed pressure drilling system. Finally, the paper puts forward some proposals for the development of the managed pressure drilling technology in the future.