In general, the number of emergency EICU, surgical ICU, neurology NICU, neonatal NICU, pediatric monitoring PICU and cardiac CCU is generally 5% of the total number of beds; It is necessary to set up special channels to separate different people and logistics, to separate doctors and patients, to purify sewage, and to minimize all kinds of interference and cross-infection; The overall layout of ICU should be divided into medical area where beds are placed, medical auxiliary room area, sewage treatment area and living auxiliary room for medical staff, and clearly distinguish clean area, semi-clean area and polluted area. Each area is relatively independent, and the space with the same cleanliness is centrally arranged to reduce mutual interference and effectively control the occurrence of cross-infection. Unit composition: ward, clean and sterile ward, positive and negative pressure conversion ward, central workstation, treatment room, disposal room, equipment room, sewage collection and washing room, doctor's office, director's office, demonstration room, medical duty room, men's and women's locker room, staff toilet, dining room, medical passage, patient passage, visiting passage, sewage passage, family waiting area, family conversation room and family lounge.