Carbon fiber/waterborne epoxy resin（CF/WEP） composite coatings were prepared using Q235 steel as a substrate to simulates the corrosion behavior of Q235 steel insandy flowing seawater environment by using scouring corrosion test. By analyzing the electrochemical behavior，corrosion product morphology and corrosion weight loss of Q235 steel after erosion corrosion，the erosion corrosion resistance of CF/WEP compositecoatings was investigated and the mechanism of erosion corrosion resistance was explained.The results showed that the prepared CF/WEP coatings could shield sand particles and hadgood scouring corrosion resistance under the condition of scouring speed of 3 m/s and 1. 0% sand content. Under the environment of 1. 0% sand content scouring，when the scouring speed was 5 m/s，the corrosion area of the specimen increased and the coating ruptured；when the scouring speed was 1 m/s and the sand content increased to 1. 5%，the coating was ruptured by the sand particles，the sand particles from the rupture into the inside of the coating and aggregation，and the ruptured edges of the coating were very easy to form corrosion pits. Thecorrosion products of blank and coated specimens flushed were mainly  α-Fe₂O₃，α-FeOOH，γ-FeOOH，γ-Fe₂O_{3 and} Fe₃O₄ phases.