Abstract:Congo (gold) mine slope based on the actual situation, with weak intercalated layer thickness and rainfall as variates, the coupling and the slope safety factor research, based on Geostudio - SEEP/W and SLOPE/W module of computing power, Bishiop method is applied to calculate the minimum safety factor of slope under different rainfall and different interlayer thickness, meantime analyzed the sliding surface and the seepage of dump slope.Research shows that increased rainfall result in rewater level rising gradually, shearing strength reduced, safety factors decreasing gradually;The thickness of the intercalated layer increased, the radius of the sliding surface increased, the anti-sliding force decreased, the safety factors decreased, which the reduction rate is greater than the rainfall.