In this paper, the quick hot breaking-emulsion and floatation separation process of oil material recovery from oily sludge obtained from an oil field was probed to obtain the essential parameters in the relevant engineering design or practices. The optimal process was as follows. Firstly, the mixture containing 25% oily sludge and 75% water was adjusted to a pH of 6, following by adding about 0.4% emulsion breaking agent, and then heating to 80℃ under stirring slowly, The crude oil separation was finished after stirring softly for 15~20 minutes at 80℃. Secondly, at the room temperature, the major-oil-removed mixture was further treated by means of flotation for about 10 minutes in order to separate the residual oil. The oil content of the mud cake formed by the centrifugal separation of the last mixture was less than 1%. And the result that centrifugal separation mixture liquid for the next oily sludge treatment was great. Furthermore, the test result of planting clover on the soil sample composed of the dry mud cake and some seedbed soil showed that the seed germination and growth were normal.