Diabetic patients are often prone to co-infections. In our clinical work, we found that the types of diabetic infections vary by age, gender and season. Respiratory tract infections: Diabetic patients, especially the elderly, have lower resistance and are prone to acute and chronic bronchitis, pneumonia, emphysema, tuberculosis, etc. during the change of seasons, such as autumn and winter, winter and spring. All patients, especially those with a history of chronic lung disease, should pay attention to the prevention of infection during the change of seasons, wear a mask if necessary, avoid crowded places, and have a chest X-ray 1-2 times a year. In case of respiratory tract infection, you should consult a regular hospital to avoid delaying the disease and causing incalculable consequences. Urinary tract infections, urinary tract infections are most common in summer, especially in older women, with clinical manifestations such as frequent urination, urgent urination, painful urination, low fever and other symptoms, urine routine suggesting increased urine leukocytes, urine bacterial count, urine occult blood, urine protein may be positive, blood routine suggesting infection signs. Patients are advised not to take oral antibiotic treatment by themselves after the above symptoms appear, so as not to cause antibiotic abuse, leading to multiple drug resistance and bringing difficulties to clinical treatment. Biliary tract infection, biliary tract infection in diabetic patients is generally insidious, in clinical work, I have seen an elderly diabetic patient, long-term fever, went through the hospital rheumatology, hematology, respiratory department, and finally found in the endocrinology department biliary tract infection, after drainage, fever symptoms then relieved. Therefore, diabetic patients with prolonged low-grade fever should think about the presence of biliary tract infection after excluding common infectious diseases. Skin infection, skin infection is more common in diabetic patients, mostly seen in patients who do not pay attention to hygiene, such as folliculitis, boils, carbuncles, cellulitis, etc. If patients have such symptoms, they should go to the hospital in time, otherwise, it will lead to septic infection of the soft tissue of the skin, which is difficult to cure. Diabetic foot, diabetic foot is familiar to everyone. In daily life, affected patients should pay attention to foot hygiene, avoid wearing unsuitable shoes, avoid trimming toenails too short, as well as going to podiatrists for pedicure and pedicure.