Abstract: Ion beam driving is a critical method for producing high energy density materials. It is of great significance to study the change of ion charge state and the generation of ionized electrons on the penetration track for understanding the energy deposition process of ion beam in the target. A method for calculating impact ionization of heavy ions along the tracks is proposed in this paper. Firstly, the ETACHA4 code is used to calculate the energy and charge state with penetration depth in collisions of heavy ions (He²⁺, U⁹²⁺) with solid targets (D, Pb). Then the CTMC code is used to obtain detailed results of impact ionization along the track. The results of He²⁺ and U⁹²⁺ ions colliding with Pb target reveal that the energy of ionized electrons is concentrated in the 0~100 keV range, and the average ionized electron energy increases with the penetration depth. The average electron energy does not change considerably when the incident energy is modest (~ tens of MeV/u). For U⁹²⁺ ions colliding with D target, the average energy of ionized electrons is distributed below 100 eV, and it remains almost constant, maintaining at 16~18 eV. The results of this study can help to further the numerical simulation of high energy density materials driven by heavy ion beams, as well as serve as a reference for target design.