The hatch covers for each cargo hold could be made of 2, 4 or 6 panels, which can be folded to fore&after sides by the mode of 2+2 or 2+4. Hatch cover uses flat-topped mode and mixed-frame structure, and its uniformly distributed load meets the requirements of international conventions. Watertight rubber uses sponge-core tape, hatch cover has two drainage systems to improve the watertight performance. Around the hatch cover has open-type fast cleats. Open&close hatch cover by hydraulic power which works smoothly, reliably and without noise. The time for opening the hatch cover is about 5 minutes.