We have investigated the structural sequence of BaxC70 binary systems. X-ray diffraction measurements revealed that there exist at least four stable phase at x=3, 4, 6, and 9. Among them, structural models are presented for Ba3C70 and Ba9C70. Ba3C70 takes an analogous structure to A15-Ba3C60, but the unit cell is distorted to tetragonal with the cell doubling. Ba9C70 is fee, involves a distorted cube of Ba8 in the octahedral interstices. This x=9 structure is also known in K9C70 as a saturated phase.