The whole study mainly includes the following parts:
1. Establishment of a database of patients with kidney disease, and training data entry specialist in every center.
2. Conduct propaganda of kidney disease knowledge, training professional doctors in center hospital and community hospital.
3. Search for high-risk patients, and screening for patients with kidney disease from community residents in community hospital.
4. Establishment of a standardized and orderly patient referral process from community hospital to center hospital or three level of first-class hospital.
