Dude. Okay PAL is the main mode mainly used in Asia and neighboring continents. It transmits 25 frames per second, and each frame consists of 625 scanning lines. PAL system can effectively avoid stroboscopic problems in some light. Although ntsc transmits 30 frames per second, each frame consists of 525 scanning lines, which is obviously low. Moreover, ntsc will encounter the problem of flashing display screen when recording 30 frames of video.