An improved structure of a cover assembly is used to install one end of a space bag, which includes a bunch of mouthpieces, a lower cover and an upper cover. One end of the space bag passes through the beam mouth piece, and a plug part is formed in the axial direction of the assembly position of the beam mouth piece and the space bag. The lower cover has an embedded part, the embedded part includes a first wall area connected to a second wall area, and a bottom layer connected to the second wall area, and the second wall area has an inclined structure. A plurality of first air holes and a plurality of second air holes are formed in the second wall area and the bottom layer, the lower cover system is embedded in the plug portion, and the second wall area is separated from the inner wall surface of the plug portion. The upper cover system is installed on the lower cover body. Air flow can flow into the space bag through the first air hole and the second air hole, so this creation has good air permeability.一種封蓋組改良結構係用以安裝在一太空包一端，其包含一束口件、一下蓋體以及一上蓋體。該太空包一端穿過該束口件，一容塞部形成在該束口件與該太空包的組立位置的軸向內部。該下蓋體具有一嵌入部，該嵌入部包含一第一牆區連接一第二牆區，以及一底層連接該第二牆區，該第二牆區為傾斜構造。複數第一氣孔以及複數第二氣孔係形成在該第二牆區及該底層，該下蓋體係嵌入該容塞部，該第二牆區係相離該容塞部的內壁面。該上蓋體係安裝在該下蓋體。氣流可經由該第一氣孔以及該第二氣孔流入該太空包內部，故本創作具有良好的透氣性。
