On the basis of analyzing some classical improved methods, an evidence combination method based on information determined by P distance is presented for dealing with highly conflicting evidences. In the condition of ensuring the minimum of whole evidence conflict, the distribution model of evidence weights is set up, the evidence weights are acquired by means of genetic algorithm, then the obtainable information of evidence is determined, the BPA function are modifies according to the evidence weights. An example indicates that the improved D-S method can give a more reasonable combination results and have the capable of anti-jamming and the lower risk of decision-making.