In order to better guide the dosage of chemical oxidants in the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil, KMnO<sub>4</sub>, Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and H<sub>2</sub>O<sub>2</sub> were selected to study the kinetics, soil oxidant demand (SOD) and its influencing factors under four different plant areas in Chengdu, China. The results showed that KMnO<sub>4</sub> and H<sub>2</sub>O<sub>2</sub> are rapidly consumed within 1 d. The consumption rate decreases rapidly after 1 d of the reaction, while the consumption rate of Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> is relatively stable. The reaction laws of the three oxidants are basically consistent with the first order kinetics. When the doses of KMnO<sub>4</sub>, Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and H<sub>2</sub>O<sub>2</sub> are 1, 2,12 mmol/g, the SOD ranges of KMnO<sub>4</sub>, Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, and H<sub>2</sub>O<sub>2</sub> for each plot are 44.91~96.06, 40.91~52.86, and 371.47~406.25 g/kg, respectively. Statistical analysis show that the maximum demands of KMnO<sub>4</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> are significantly correlated with soil organic matter content, soil clay and soil water content. Among them, soil organic matter content has the greatest effect on the soil oxidant demand of KMnO<sub>4</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, with the contribution rates reaching 31.57% and 40.24%, respectively. According to the experimental results and considering the economic factors, the oxidants KMnO<sub>4</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>