台灣位處於環太平洋地震帶，山多平原少以及亞熱帶氣候，再加上南北狹長的地形與人口高密度化。為了疏緩交通與居住問題所跨越山區而鋪設道路，及山坡地開發等所造成的人為破壞，一旦降雨及地震等種種自然環境因素，所引發的邊坡破壞問題經常造成相當嚴重的災害，邊坡穩定的工作刻不容緩。在邊坡穩定分析之領域中，主要目標為求取安全係數和決定對應之臨界滑動面，為解決此兩大問題，其常見之方法有極限平衡法、極限分析法、變形分析法、斷裂力學法等等。
一般最常使用的邊坡穩定程式是極限平衡法的STABL 軟體以及變形分析法的FLAC3D軟體，而STABL軟體除了使用上較方便且簡單外，但其分析過程中並不能考慮到變形、強度因素，以及做了許多簡化的假設也需要預先假設滑動面位置等限制，若要加入地震力分析，也無法輸入真實地震波，僅能輸入尖峰加速度值，使得其分析上面有著過多的限制以及不完整，相較於FLAC3D軟體有著更多使用上的限制。
故本研究以變形分析法（FLAC3D軟體）作為邊坡穩定數值分析之理論基礎，採用剪力強度折減法(shear strength reduction technique)之觀念來訂定合理的邊坡安全係數並判斷可能破壞滑動面位置，再與極限平衡法（使用STABL軟體）之分析結果進行討論以及比對，而剪力強度折減法發展至今，大多數學者皆以單一土壤性值得邊坡案例來分析，但通常實際邊坡土壤性質往往不只一種，加上台灣土壤以崩積土佔最大的比例，並覆蓋在其他岩層或是土壤上面，所以就必須考慮至少兩層土壤參數，並加入地下水位與地震資料，分析出來的結果將會更符合實際狀。

Taiwan is located on the seismic belt of Pacific Ocean with mountainous landform and high populations. In order to resolve the traffic and resident problems , people destroy the natures to build the highway and others facilities , which cause huge damages of sloping fields. This research is discussed on the possible slide site of layered slope in an earthquake and the changes of safety coefficient with Finite Difference Methods (use FLAC3D software) plus shear strength reduction technique .
The software people used to analysis the stability is STABL . It is easy to use but the defect is STABL can’t be considered of transformation and strength factors , also it has many restricts .
This research is based on Deformation Analysis Method to analysis slope stability value and finds the slope safety coefficient through shear strength reduction to predict the sites of destroyed layer slope . And compared the result with Limit Equilibrium Method (use STABL software) . The research also considered of multilayer parameter plus underground water and earthquake data to simulate the real situation .

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