A complex process of micro electrolysis and biofilm was developed to continuously treat organic wastewaters containing heavy metal ions such as Cu2+ and Cr3+, and the relevant purifying mechanism was also addressed. In detail, organic materials in wastewater could be consumed as nutritious source by biofilm composed of aerobes and anaerobes. However, for heavy metal ions (Cu2+, Cr3+), part was removed by electrodeposition, and some was adsorbed on biofilm. In order to compare with the combined process of micro electrolysis and biofilm, the experimental data of micro electrolysis process (intermittent) or biofilm process (continuous) were provided, and the kinetic data of C6H12O6 (glucose) biodegradation by cultured microbes or acclimated microbes were also obtained. These experimental results indicated that for wastewater initially consisted of C6H12O6 (500mg. L-1), Cu2+ and Cr3+ (10mg. L-1), after treatment, its concentrations of C6H12O6, Cu2+ and Cr3+ were lowered to the level of 55-65 mg.L-1, and less than 1 mg.L-1, respectively. And the industrial reused water standards could be met by treated wastewater.