Genetic testing is effective for specific types of diabetes such as MODY, mitochondrial diabetes, etc. Clinical typing of diabetes includes type 1 diabetes, type 2 diabetes, gestational diabetes, and special types of diabetes. Some diabetes mellitus is inherited from single gene or multiple genes and these diabetes mellitus can be tested by genetic testing. With the completion of the human genome project, human beings have become more aware of their own genes, and genetic testing is important for clarifying the typing of diabetes and guiding the use of medication. Genetic testing is mainly for some special types of diabetes, such as MODY and mitochondrial diabetes. It is recommended that diabetic patients under the guidance of their doctors to carry out the relevant tests.