1, mechanical grinding method: grinding graphite material into fine graphite powder by mechanical means, which is suitable for occasions with loose particle size requirements.

2. Chemical reduction method: graphite material is reduced to graphite powder by chemical method, which is suitable for preparing high-purity graphite powder.

3. Pyrolysis carbonization method: the graphite material is carbonized at high temperature to obtain graphite powder.

4. Sieve classification method: the graphite material is classified by a sieve to obtain graphite powder with the required granularity.