Abstract: An oil sprays made up of DDVP as the main pesticide, 1,2-dichlorobenzene as an auxiliary solvent and diesel oil as a diluent is a new processing preparation. Field tests showed that the oil spray could be used for ULV aerial application, ULV area application and area smoke spraying. Some of the advantages of the oil sprays are : high-speed in killing with poison, good effectiveness, small dosage, easy operation, wide source of raw materials, handy process, low cost and so on.3Y-4 type smoke generator is simple in structure, easy in operation and maintaining and good in performance, and together with the knapsack-type duster-mist blower with internal-combustion engine would form a complete set in spraying smoke. Under specific conditions, the oil sprays can be applied through smoke-spraying method.