Flaky graphite is one of the best floatability mineral in the nature.It was difficult in processing graphite to protect the flaky structure of flaky graphite.For a crystalloid graphite in Inner Mongolia,preconcentration technology had been used to protect flake graphite.The results showed that it can increase the grade and recovery of flake graphite concentrate by 3.46% and 3.59% respectively,comparing with common flotation technology.