本篇論文中,我們利用C語言模擬半導體元件特性。發現在切割網格時會如果出現180°切角,這會造成模擬上的誤差,而為了減少這誤差產生,我們將180°切角切割成不同角度,其中會出現鈍角三角形網格,所以我們開發了鈍角三角形模組來解決這問題。先利用單一鈍角三角形模組驗證,再經由模擬電阻與實際電阻值比較,及二極體的模擬驗證來確保模擬的正確性,最後應用在包含鈍角三角形網格的相關應用,例如:MOS電容器、180°切角的改善、局部網格加密時會出現的180°切角問題,都不會造成過大的誤差,並且成功改善了鈍角三角形網格模擬上的誤差。;In this thesis, we use C language to simulate semiconductor device characteristics. We found that the 180°-angle mesh will cause simulation problem. It may have a triangle mesh with an obtuse angle if we divide the 180° angle into two angles. In order to simulate the obtuse triangle mesh, it’s necessary to develop an obtuse triangle model for 2D device simulation. The validity of a single obtuse triangle model is verified by numerical experiment. We simulate a resister and compare its result to the theoretical value. Finally, applying this obtuse model to many applications, such as MOS capacitor, 180°-angle problem, in mesh regrid.