A kind of blade configuration of grass trimmer is suitable for backpack, hand propelled or riding type grass trimmer, the single blade that can be integrally formed, or isogonism or symmetrical projection configuration one blade bearing of what periphery, and then at least two blades of grass trimmer described in what are installed. The single blade has at least two ends； Blade on the blade bearing is respectively formed with one end； The end all has an ora terminalis in convex arc-shape, and in-between position is recessed with the notch extended generally towards the combined hole direction； Left and right two avris of notch is respectively formed with one first blade and one second blade in flat； The third blade and one the 4th blade in convex arc-shape are respectively formed on the ora terminalis of the notch left and right side. This creation is designed using above-mentioned blade and notch, and blade cutting efficiency can be substantially improved, increase operational safety, and extend grass trimmer and blade service life.一種割草機之刀片構造，適用於揹負式、手推式或乘坐式割草機，可為一體成型的單一刀片，也可以為等角或對稱突伸配置於一刀片座外圍，進而安裝於所述割草機的至少二刀片。所述單一刀片具有至少二端部；所述刀片座上的刀片各形成有一端部；所述端部皆具有一個呈弧凸狀的端緣，其中間部位凹設有一個大致朝所述結合孔方向延伸的缺口；所述缺口左、右兩邊側分別形成有呈平直狀的一第一刀刃及一第二刀刃；所述缺口左、右側的端緣上分別形成有呈弧凸狀的一第三刀刃及一第四刀刃。本創作利用上述刀刃與缺口設計，可大幅提升刀片切割效能，增加操作安全性，並延長割草機及刀片使用壽命。
