Abstract: IC was applied to the simultaneous determination of fluoride, chloride, sulfur and nitrogen in imported petroleum coke with pyrohydrolysis. The optimized conditions found were as follows:① combustion temperature of high heat was 1 100℃; ② flow of oxygen was 500 mL·min^-1; ③ evaporation capacity of water vapor was about 2 mL·min^-1; ④ amount of Na₂O₂ was 0.12 g. 30 mmol·L^-1 KOH solution was used as eluant, and restraining conductance detector was used in determination. Linear relationships between values of peak area and mass concentration of the 4 ions were all kept in definite ranges, with detection limits (3S/N) of the method in the range of 0.044-0.33 mg·L^-1. Values of recovery found by standard addition method were in the range of 80.0%-96.0%, and values of RSD's (n=6) were in the range of 2.9%-18%.