Gypsum powder production technology can is divided into directly calcined and indirect calcined two species, directly calcined is using boiling furnace flue gas for media on desulfurization gypsum for heating calcined, flue gas in the of dust on gypsum powder of quality has must of effect, but investment smaller, production cost lower; indirect calcined is using hot air for media on desulfurization gypsum for heating calcined, calcined process in the media on gypsum of quality not produced negative effect, but investment larger, production cost higher; this technology used of main advanced technology, using boiling furnace provides heat source, can maximum reduce coal consumption, and full using hot, is currently industrial gypsum calcined technology in the ideal of device.