The homogeneous balance method for constructing solitary wave solutions and soliton solutions is further developed on obtaining quasi-solution by using step-by- step principle.The main advantage of the extended approach is to avoid the probl em of “intermediate expression swell”.The effectiveness of the method is demon strated by application to the generalized Boussinesq equation and the bidirectio nal Kaup-Kupershmidt equation.The one-soliton,two-soliton and three-soliton solutions with multipe collisions are derived for these two equations with the assistance of Maple.