Physical layer security transmission issue in simultaneous wireless information and power trans-fer ( SWIPT) relay network with multiple eavesdropers is investigated in this paper.A novel cooper-ative beamforming algorithm is proposed to balance performance of cooperative jamming method and zero-forcing method.Using location prior information of eavesdropper,the proposed method imposes zero-forcing constraints on the capable eavesdropper and cooperative jamming on remaining weak eavesdropper,respectively.Compared with classical cooperative jamming or zero-forcing methods,the proposed method can compromise computational complexity and secrecy rate.Performance of the method is verified by simulation experiments.