Abstract: Imidazolinyl-ammonium-salt HF-01 was synthesized from oleic acid,diethylenet riamine and benzyl chloride.Through orthogonal experiment,the optimal complex HF-02 was investigated.The effect of HF-02 concentration,reaction time and calcium concentration on scale inhibiting performance was studied.When HF-01 was 18 mg/L,1,4-butynediol was 14 mg/L,tween20 was 6 mg/L,alcohol solution (mass ratio of 50%) was 21 mg/L,cinnamic aldehyde was 2 mg/L,the corrosion inhibition efficiency of HF-02 to A3 steel reached 99.97%.Under the condition of HF-02 10 μg/ml,reaction time 6 h and calcium 100~200 mg/L,HF-02 had optimal scale inhibition.