The real physics models are usually quite complex with some arbitrary paramcters which will lead to thenonintegrability of the model. To find some cxact solutions of a nonintegrable modcl with some arbitrary parametersis much more difficult than to find the solutions of a model with some special parameters. In this paper, we make amodification for the usual direct method to find some conditional similarity solutions of a (2+1)-dimensional generalnonintegrable KdV equation.