The design of appropriate, cost-effective remedial measures requires a clear understanding of the processes that are causing the landslide. This understanding require a detailed site investigation, a reconnaissance of the landslide as soon as possible after it's occurrence can allow important observations of the processes involved. A key step in analyses of soil slope stability is measuring or estimating the strengths of soils. Slope failures provide a valuable opportunity to estimate the strengths of materials involved in the failure.Stability analyses are performed to back-calculate strengths that could have produced a failure . Back analysis of strengths has advantages over laboratory testing in that the scale is much larger and the materials are in their in situ state.Using site investigations and an appropriate method of  analysis it is possible to develope a model of the slope at the time that is failed.In this paper Farahzad landslide have been studied by site investigations and then  have been evaluate shear strength parameter from back analysis of  failed slope.

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