The local probable maximum flood combination is always the academic problem that we should make clearer in PMP/PMF calculation. Nowadays, there is still no normative method for ascertain of the local probable maximum flood combination. According to the principle of PMP/PMF calculation, this paper introduces a method for calculating of the probable maximum floods at the location of water-power station base on the local combination of the probable maximum floods. The rationality of the method has been demonstrated. The result shows that method is suitable to the basins of the water-power stations that consists of different climatic zones, and the upriver floods that consist of mountain snowmelt/ melting ice.