Abstract: Based on the jet combustion test equipment researched and developed, the jet pressure, nozzle diameter, hydraulic liquid temperature, distance from th e nozzle to ignition source and other factors affected to the jet combustion performances of the hydraulic liquid was investigated.The results showed that under the con dition of the stabilized jet flow formed, the jet combustion performances of the hydraulic liquid would not have a big variation under the different jet pressure and the diff erent nozzle diameter and the jet combustion performances would be different evidently with the different hydraulic liquid.With temperature of the hydraulic liquid increa sed, the sustained combustion time of the hydraulic liquid would be relatively prolonged after the jet flame removed.With the distance from the nozzle to the ignition sou rce increased, the sustained combustion time of the hydraulic liquid would be relatively reduced after the jet flame removed.The combustion resistance of the jet combu stion with different hydraulic liquid would be the water-glycol liquid, the water-free synthetic hydraulic liquid and the abrasion hydraulic oil in sequence.