Abstract：Simplified Janbu slice method is improved，while the width of every slice is supposed to be equivalent except the first and the last ones. An accelerating hybrid genetic algorithm(AHGA) is presented，which can freely search for the most dangerous slip surface of slope and calculate its corresponding minimum safety factor without supposing the geometric shape of the most dangerous slip surface. AHGA is established by setting Powell method in real-code genetic algorithm(GA)，which is taken as a genetic operator that parallels to the selection，crossover and mutation operators. The advantages of Powell method and GA such as better adaptive ability，rather high convergence speed are considered in the new method；and this method can get the global optimal solution to the optimization problems. Finally，the accuracy of AHGA is validated by a common example，and then the AHGA is applied to search for the most dangerous slip surface of slope along a highway，and the result is compared with that obtained from in-sity investigation. It is shown that this kind of method can get the more optimal and precise solution than simple genetic algorithm(SGA).
