The utility model provides an upper portion that but adjusted window is equipped with the slide on the inner wall of window frame outside, at outer window frame and an in the middle of the slide, be equipped with two circular recesses of upset respectively that the lower part. The one side on interior window frame A's upper portion and interior window frame B's upper portion is equipped with slider A and slider B respectively, in the slide of slider A and the equal sliding connection of slider B window frame upper portion inner wall outside. One side of interior window frame A's lower part and interior window frame B's lower part is equipped with slider C and slider D respectively, in the slide of slider C and the equal sliding connection of slider D window frame lower part inner wall outside. Pass through hinged joint between the interior window frame both sides limit that A's is adjacent with interior window frame B. Adjusting the recess at the outside fixed connection wind direction of another side of interior window frame A, adjusting the fixture block at the outside fixed connection wind direction of another side of interior window frame B, the wind direction is adjusted the recess and is all corresponded with the position with the big or small of wind direction regulation fixture block. The utility model discloses the casement is conveniently washd to adjustable scope of windowing.