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In layered transition-metal dichalcogenides (TMDs), superconductivity often emerges in the vicinity of symmetry-breaking charge-density-wave (CDW) ground state.The interplay (competition/coexistence) between the CDW and superconductivity remains mostly controversial.In the present work, we study the Fe-doping effect on CDW and superconductivity in 1 T-FexTal-xSSe.Our first-principles calculations based on density functional theory show the Fe-doping can effectively inhibit the commensurate CDW.The pseudo-gap due to the localization of Ta-5d electrons in CDW phase is gradually suppressed by Fe-doping, and the topology of the Fermi surface changes from quasi-one-dimensional to three-dimensional character.We suggest the superconductivity may evolve with the change of nearly-commensurate CDW domains.Our experimental results prove the theoretical predictions and show the enriched electronic phase diagram.Our present results indicate that besides the hydrostatic pressure the element substitution is an effective method to study the relationship between SC and CDW in TMD system.