Abstract: The angular distributions for charge exchange reaction of 1H(6He, 6Li)n are measured in inverse kinematics with a secondary 6He beam at the energy of 4.17 A MeV producedbythesecondarybeamfacilityatHI13tandemaccelerator,Beijing.Thecomparison between experimental results and theoretical calculation indicates that both the ground state of 6He and the secondary excited state of 6Li have halo structure. The present work reveals the neutronproton halo structure in the secondary excited state of 6Li predicted by K. Arai et al for the first time.