In the summer of 2016 we carried out an experiment on 6He - proton elastic scattering at RIKEN, RIBF at 200 MeV/nucleon to probe 6He spin-orbit potential. Investigating change of spin-orbit interaction with unstable neutron-rich nuclei is of real physical interest as it is well known that spin-orbit coupling plays an important role in nuclear structure and reactions. The data obtained from this experiment should help us to understand how an exotic structure of the neutron-rich nucleus affects spin-orbit coupling in proton-nucleus scattering. Specifically, to investigate relation between diffuse nuclear density distribution in neutron-rich 6He and predicted weakening of spin-orbit coupling.In this presentation current status of data analysis will be presented. Preliminary result on obtained p-6He elastic scattering cross-section will be given.