Abstract: In the present study， two oil degradation bacteria W\|1， W\|2 were isolated and used to optimize reaction conditions by single\|factor and orthogonal experiments on electric field， electrode materials and electric field strength. It was shown that as for W\|1， when the electric field was parallel grid， electrode material was graphite electrode， and the electric field strength was 150 V·m-1， the oil degradation rate was the highest. As for W\|2， when the electrode material was graphite， electric field was parallel\|plate， and electric field strength was 200 V·m-1， the oil degrading rate was the highest.

Key words: electric field, microbial remediation, oil contaminated soil