On November 6,2010,an M class solar are was explored on the Sun and the corona mass ejection event associated with the M are reached the moon two days later.ChangE-2 spacecraft operated on the polar circular orbit,with altitude of 100km above the lunar surface.Solar Wind Ion Detector (SWID) on CE-2 observed intensive 4He+ flux when SWID oriented to the sun.4He+ flux was identified from the energy spectrum of SWID by comparing with solar wind proton and alpha particles energy spectrum.We analyzed the ion flux energy spectrum and found that the peak flux energy/q of solar wind proton was about 430eV,and solar win alpha particle peak flux energy/q was about 852eV.Two peaks were presented in the higher energy band for the CME event on November 8,one was 1687eV,and the other was 3198eV.We give explanation of this phenomenon.More investigations are needed to identify ion species,and to understand the physical processes to generate the fourth intense ion flux in dayside lunar exosphere.