Using the improved homogeneous balance method, the nonintegrable generalized HirotaSatsuma equations were reduced to integrable model, i.e. KdV equation, and then the multiple soliton solutions of generalized HirotaSatsuma equations were obtained by solving KdV equation. By dint of multiple soliton solutions, we analyzed the interaction between two singular solitons and the interaction between bell type soliton and singular soliton, and found some new important properties of interaction.