A large sized safe windmill with high efficiency is made up of plural vane-assemblies.Each assembly includes an axle center (2) that connecting the adjacent vane-assembliesby the connectors (21) for transferring power on the ends of the center.Then the power is finally transferred to the generator (82) that generatingelectricity atthe bottom of the windmill. There are plural blade-assemblies extend from theaxlecenter. The vane blade (1) has an extending plane (11) that bending relativeto theoutside of the axle center, and the extending plane is angled with the bladeabout18~20°. There are rotating axes (13,14) controlling the rotation ofplurality of vaneblades both on the upside and on the underside thereof. There are horizontalprotectiveshafts (15,16) around the axes and vertical connecting shafts (17) between thevaneblades. The vertical connecting shafts transfer power from the blades to thehorizontalprotective shafts, and thereafter the power concentrates to the axle center. Adogvane(4) and a wind-speed switch (6) are set on top of the windmill, which vary therotation ofthe vane blades by means of the changing the direction and degree of the wind.
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