A virtual keyboard system and typing method are provided. The virtual keyboard system includes a projector configured for projecting a key area having keys onto a projection plane, a storage device configured for storing a key value mapping table, a typed position coordinate obtaining device configured for obtaining coordinates of a typed position of the key area, and a key value obtaining device configured for obtaining key values corresponding to the coordinates of the typed position from the key value mapping table. The key values are outputted when a projected virtual key area is touched by a user.