High density matter physics at J-PARC-HI

Physics prospective of the high density matter using heavy ions collisions is presented. The J-PARC-HI project which is a unique lab to tackle the high density matter physics is described. The world highest rate of heavy ion beam of 10${}^{11}$ Hz is aimed at J-PARC-HI which enables us to perform measurements of hadrons, fluctuation of conserved quantities, dileptons, multi-strange hypernuclei. New event selections are also discussed to reach a highest baryon density on the ground.