A kind of ceiling improvement of crop growth facilities,Include: the first supporting element of predetermined number,It is positioned apart from the top of what crop growth facilities； One first fluffy part,Fix the what equal first supporting element leading portion； One second fluffy part,This waits the first supporting element Hou section to fixed what,The Hou edge predetermined distance of the leading edge of the second fluffy part and the first fluffy part,One first notch is formed accordingly； And the fluffy part of third,This waits the middle section of the first supporting element to fixed what,And covered first notch,The Hou section top of the leading portion covering fluffy part of what first of the fluffy part of the third,The first overlapping portion is formed,But the first fluffy part Hou section top surface and the leading portion bottom surface of the fluffy part of third between do not paste it is closed,Above the leading portion of the Hou section covering fluffy part of what second of the fluffy part of the third,The second overlapping portion is formed,But it is not pasted between the leading portion top surface of the second fluffy part and the Hou section bottom surface of the fluffy part of third closed yet.一種作物栽培設施之頂蓬改良，包括有：預定數目之第一支撐件，間隔地設置於作物栽培設施頂部；一第一蓬件，固定於該等第一支撐件前段；一第二蓬件，固定於該等第一支撐件後段，該第二蓬件之前緣與第一蓬件之後緣相隔預定距離，據以形成一第一缺口；以及一第三蓬件，固定於該等第一支撐件之中段，並將該第一缺口予以遮蔽，該第三蓬件之前段覆蓋於第一蓬件之後段上方，形成第一疊合部，但第一蓬件之後段頂面與第三蓬件之前段底面之間並未黏貼密閉，該第三蓬件之後段覆蓋於第二蓬件之前段上方，形成第二疊合部，但第二蓬件之前段頂面與第三蓬件之後段底面之間也未黏貼密閉。
