The inhibition efficiency of Cnidoscolus Chayamansa leaves extract on the corrosion of Copper in 1.0N Hydrochloric acid environment in various concentration with temperature and period of contact has been investigated by mass loss measurement. The observed results indicate that the inhibition efficiency increased with increase of inhibitor concentration but decreased with rise in temperature and time. The inhibitor obeys Langmuir and Temkin adsorption isotherms. Thermodynamic parameters (Viz: Ea, Qads, ∆Gads, ∆H and ∆S) indicates that the adsorption of the inhibitor is physisorption, exothermic and spontaneous. Corrosion product on the metal surface in the presence and absence of inhibitor is characterised by UV, FT-IR, XRD and EDX-SEM spectral techniques.