Nucleon density distribution of proton drip-line nucleus 17Ne

17Ne is one of the candidates for proton halo nuclei. To study the halo structure of 17Ne, we measured the reaction cross-sections ( σ{}R) and deduced the density distribution of 17Ne through the energy dependence of σ{}R. From the deduced density, it is found that 17Ne has a long density tail which is consistent with the picture of two valence protons of 17Ne occupying the 2s1/2 orbital.