Inclusion Criteria:  The age of 18-45 years, single pregnancy, Han nationality; GDM diagnosed between 24 to 28 weeks of gestation, either of the following: fasting plasma glucose ≥5.1 mmol/L, 60-minute plasma glucose ≥10.0 mmol/L, 120-minute plasma glucose ≥8.5 mmol/L, during a 75g oral glucose tolerance test (OGTT). Plan to deliver the baby in Women's Hospital School Of Medicine Zhejiang University; Can operate mobile phones and related software; Voluntary participation in this study; Education background: junior high school or above.  Exclusion Criteria:  Type I or II or other non GDM diabetes mellitus; Severe pregnancy complications or complications: such as malignant tumor, preeclampsia, severe intrahepatic cholestasis of pregnancy syndrome, pregnancy with antiphospholipid antibody syndrome, severe anemia (hemoglobin<90g/L, etc.), cardiac insufficiency cardiovascular disease (such as myocardial infarction, heart failure, pulmonary hypertension, stroke history, coronary heart disease, valvular heart disease, etc.), stroke (moderate), liver disease (such as hepatic insufficiency, acute viral hepatitis, etc.), lung disease (such as restrictive lung disease, emphysema, liver cirrhosis, pulmonary heart disease, etc.), kidney disease (such as nephrotic syndrome, chronic nephritis, renal insufficiency, etc.), chronic hypertension, thyroid disease (such as hyperthyroidism, hypothyroidism, thyroiditis, etc.), other endocrine diseases (such as Cushing's syndrome Acromegaly, venous or arterial thromboembolic diseases, rheumatic immune diseases, etc; The combined conditions that may affect the diet exercise therapy include severe food allergy, dyskinesia (physical disability), history of bariatric surgery, major gastrointestinal diseases (such as gastrointestinal bleeding, inflammatory bowel disease, gastrointestinal tumor, active stage of peptic ulcer, chronic intestinal obstruction, etc.), restrictive lung disease, history of two or more adverse abortions, placenta previa, repeated and persistent bleeding threatened abortion, threatened premature birth, hyperemesis gravidarum, vegetarians, etc; Other conditions: such as mental disorders, cervical incompetence, genital tract deformity, etc; Patients who are taking medicine that may affect glucose metabolism, such as ritodrine, prednisone, etc; Patients who are participating in other clinical studies; The researchers believe patients who are not suitable for this study