The present invention discloses a method and a system for controlling playing of monitoring video record. The controlling playing method includes the following steps: A. during the process of recording a monitoring video record, detecting a picture of a video record in real time and marking a time index for dynamic frame(s) in the video record; B. during the process of playing the monitoring video record, obtaining the lime index and playing the dynamic frame in the monitoring video record according to the time index. The controlling playing system includes: video record recording means, motion detecting means and video record playing means, wherein the video record recording means is configured to record a monitoring video record; the motion detecting means is configured to detect a picture of the video record in real time and mark a time index for a dynamic frame(s) in the video record during the process of recording the monitoring video record by the video record recording means; and the video record playing means is configured to obtain the time index from the motion detecting means and play the dynamic frame(s) in the monitoring video record according to the time index during the process of playing the monitoring video record. The present invention reduces the time of playing monitoring video record greatly without missing any effective information.