Abstract: Embodiments of the disclosure provide methods and systems for inputting content. The method can include: determining location information of a virtual surface in a three-dimensional space; obtaining location information of an input object in the three-dimensional space; determining, according to the location information of the input object and the location information of the virtual surface, whether the input object is in contact with the virtual surface; determining a trajectory of the input object when the input object is determined to be in contact with the virtual surface; and determining input content according to the determined trajectory.