Abstract: To illustrate the transport behaviors of deca-brominated diphenyl ether(BDE-209) in soils with different contents of insoluble organic matter, the heavy metal ions Fe³⁺, Cu²⁺ and Zn²⁺ with loads of 0-100 mg/g were investigated.The verities of the forest soil colloids(≤ 1 μm, insoluble organic matters of 2.2%) and the farmland soil colloids(≤ 1 μm, insoluble organic matters of 4.7%) with BDE-209 were carried out to check their transport behaviors with rotary mixers under the conditions of r=(30.0±1.0) r/min, T=(25.0±0.5)℃, ratio value of V_water and m_soil=5 and pH=6.8±0.1.The balance times and the equilibrium contents of the heavy metal ions(Fe³⁺, Cu²⁺ and Zn²⁺) were 40 h and(49.4±1.2) mg/g for the forest soil colloids and 32 h and(81.7±1.9) mg/g for the farmland soil colloids, respectively.For the forest soil colloids(loads of 0-60 mg/g) and farmland soil colloids(loads of 0-80 mg/g), the flocculation effects of Fe³⁺ on the soil colloids were best compared with those of Cu²⁺ and Zn²⁺.For the forest soil colloids with the loads of 60-100 mg/g and the farmland soil colloids with the loads of 80-100 mg/g, the concentrations of the soil colloids were maintained at (49.3±1.3) mg/L and(50.4±1.1) mg/L, respectively.Simultaneously, the BDE-209 concentrations in the supernatants were obviously decreased from(388.5±13.2) ng/L to(24.7±21.7) ng/L for the forest soil colloids and to(25.4±18.8) mg/L for the farmland soil colloids.Moreover, the heavy metal ions did not directly change the BDE-209 transport behaviors by calculating the BDE-209 contents((493.1±6.8) ng/g) in those soil colloids.The heavy metal ions affected the BDE-209 transport behaviors in the soil environment mainly by changing the behaviors of soil colloids to move the contaminated soil colloids, freely passing through the porous soil matrix to potentially pollute and threaten other clean and safe districts.