Fresh air control method and system for green building

The invention relates to the technical field of fresh air, and discloses a fresh air control method for a green building, target building BIM model data can be obtained, target area division can be accurately carried out on a target building through the practical BIM model data, and the target area can be divided by taking a room as a unit according to the actual situation. As the temperature demand intervals of the adjacent target areas are possibly the same or similar due to similar functions or similar demands, the target areas with the same temperature demand intervals can be combined to obtain the same-temperature area group, and then the fresh air path is set for the same-temperature area group. Therefore, the influence of fresh air on the indoor air conditioner temperature can be avoided, and unnecessary loss of the air conditioner is reduced. And a method. Compared with the scheme that fresh air treatment is directly carried out on the whole target building, the scheme that the target area is divided