A sorbitan phosphate corrosion scale inhibitors (SPA) was prepared from the reaction monomers of sorbitol and phosphoric acid. The influence of relevant factors on the corrosion performance of SPA was studied using the corrosion rate as the evaluating index. The scale and corrosion inhibition performance of SPA was evaluated by using the static scale evaluation and the atmospheric static method, and the mechanism of corrosion inhibition was discussed though electrochemical polarization curves. The experiment results showed the SPA had best property when synthesized at atmospheric pressure, the mole ratio of sorbitol (SOR) and phosphoric acid (PA) was 3:1, the esterification reaction time was 3 h and the optimum temperature was 120℃~140℃. The inhibition rate of the SPA on CaCO3 scale was more than 90% when the mass concentration was greater than 25 mg/L. The corrosion rate of A3 steel in the simulated water was 0.0234 mm/a and the corrosion rate was 85.26% when the dosage of the SPA was 100 mg/L. The potentiodynamic polarization curves showed that SPA was a mainly cathode-controlling mixed corrosion inhibitor.