Ion dynamics inside the cometosheath of Halley is described based on the plasma observation by Suisei. The pickup shells of water-group ions and protons of cometary origin are clearly identified. Field line draping around the comet is observed within 2¿105 km of the Halley's nucleus, where magnetic field directions are derived from the symmetry axes of the ion-pickup shells. Flow turbulence is observed as short-term (period of ≲2 min) fluctutations of the anisotropy direction in the outer cometosheath (2--4.5¿105 km from the nucleus), while the flow is found to be laminar near the closest approach (1.5--2¿105 km from the nucleus). Spatial distribution of density of water-group ions (identified up to 4¿106 km from the nucleus) is also presented.