The invention proposes a wearable device. The wearable device includes an information capturing device and a processing device. The information capturing device is configured to dynamically capture a plurality of partial detected object information of a detected object in a sub-action of a dynamic event. The processing device is coupled to the information capturing device. The processing device is configured to perform an accumulation operation according to the plurality of partial detected object information, so as to obtain a plurality of location information corresponding to the sub-action of the dynamic event. The processing device compares the plurality of location information in the sub-action of the dynamic event with the plurality of location information in a previous sub-action, so as to obtain a sub-object distribution information corresponding to the sub-action of the dynamic event. In addition, a dynamic event recording system and a dynamic event recording method thereof are also provided.