A medical device, comprising a microprocessor and a digital/analog module connected to the microprocessor, the microprocessor configured to control the digital/analog module to deliver pacing impulses based on heart events sensed by the digital/analog module and according to a method for implementing a dual-chamber pacing mode without ventricular pacing, the method comprising: obtaining pacing mode information configured by a user; controlling a dual-chamber pacemaker to operate in an ADD mode and detecting whether there is a need for delivering a pace; and characterized in that the method further comprises: performing a predetermined interruption process if a need for delivering a pace is detected, wherein the predetermined interruption process comprises: determining whether a chamber to be subsequently paced is a ventricle, if it is determined that the chamber to be subsequently paced is a ventricle, determining whether there is a need for delivering a real ventricular pace, and if delivery of a real ventricular pace is not needed, delivering a virtual ventricular pace VVP to the dual-chamber pacemaker and resetting a first atrial escape interval, and terminating the predetermined interruption process; and returning, after the predetermined interruption process is terminated, to the step of controlling the dual-chamber pacemaker to operate in the ADD mode and detecting whether there is a need for delivering a pace. obtaining pacing mode information configured by a user; controlling a dual-chamber pacemaker to operate in an ADD mode and detecting whether there is a need for delivering a pace; and characterized in that the method further comprises: performing a predetermined interruption process if a need for delivering a pace is detected, wherein the predetermined interruption process comprises: determining whether a chamber to be subsequently paced is a ventricle, if it is determined that the chamber to be subsequently paced is a ventricle, determining whether there is a need for delivering a real ventricular pace, and if delivery of a real ventricular pace is not needed, delivering a virtual ventricular pace VVP to the dual-chamber pacemaker and resetting a first atrial escape interval, and terminating the predetermined interruption process; and returning, after the predetermined interruption process is terminated, to the step of controlling the dual-chamber pacemaker to operate in the ADD mode and detecting whether there is a need for delivering a pace. performing a predetermined interruption process if a need for delivering a pace is detected, wherein the predetermined interruption process comprises: determining whether a chamber to be subsequently paced is a ventricle, if it is determined that the chamber to be subsequently paced is a ventricle, determining whether there is a need for delivering a real ventricular pace, and if delivery of a real ventricular pace is not needed, delivering a virtual ventricular pace VVP to the dual-chamber pacemaker and resetting a first atrial escape interval, and terminating the predetermined interruption process; and returning, after the predetermined interruption process is terminated, to the step of controlling the dual-chamber pacemaker to operate in the ADD mode and detecting whether there is a need for delivering a pace. determining whether a chamber to be subsequently paced is a ventricle, if it is determined that the chamber to be subsequently paced is a ventricle, determining whether there is a need for delivering a real ventricular pace, and if delivery of a real ventricular pace is not needed, delivering a virtual ventricular pace VVP to the dual-chamber pacemaker and resetting a first atrial escape interval, and terminating the predetermined interruption process; and returning, after the predetermined interruption process is terminated, to the step of controlling the dual-chamber pacemaker to operate in the ADD mode and detecting whether there is a need for delivering a pace.