Abstract: In the light of the complex situation of the mineral symbiosis of flake graphite in Luobei,Heilongjiang province,the process mineralogy of the representative ore was studied and experiments such as the crushing,grinding,flotation and so on were done,on the basis of which the best mineral processing technology is determined. The results show that in the case of the 3. 5min of coarse grinding,the dosage of 250 g/t kerosene,the dosage of 25 g/t octanol,the excellent process index with the tailings grade of 0. 87%,the concentrate containing fixed carbon content of 95. 92% and the recovery of 95. 24%,can be obtained through the closed circuit process,in which,the ore is served by one roughing and one scavenging,and rough concentrate is made five cleaning after four-stage regrinding,at the same time mixed middlings 1,2,3 is delivered to roughing after scavenging while mixed middlings 4,5,6 went back to primary regrinding. This process has theoretical experience for the process design of graphite ore dressing plant.