The inhibitive effect of Ziziphus Trinervia extract on the dissolution of oil and gas pipeline steel in 1.0N hydrochloric acid was examined using mass loss and electrochemical techniques. The inhibition efficiency increased with increase of inhibitor concentration and decreased with rise in temperature. The thermodynamic parameters were computed and suggested the adsorption process is spontaneous and exothermic. Various adsorption isotherms were examined hitherto, Langmuir, Temkin, Freundlich and El-Awady and it has been found to follow Langmuir adsorption isotherm. The electrochemical studies revealed that ZT extract behaves as a mixed type inhibitor.