Abstract: The meta-synthesis approach,initiated by Prof.Qian Xuesen,is suggested to be accepted for solution making in the engineering geology system.An integration of multiple source knowledge,including experience,deduction and measurement evidence,constitutes the essential core of the proposed approach.Its basic principle is to integrate and merge the conclusions obtained in the different sources of knowledge or information.The integral agreement may support a rational solution,surmounted normal knowledge and standard.A practical example of slope stability evaluation is given in this paper for site selection of water pumping station.The decision was reached making a breakthrough over the conventional engineering solution.