Target-oriented three-dimensional imaging method and system are provided. The method comprises: determining, on a scanning object, a portion comprising a scanning target, forming an existing initial three-dimensional structure of the scanning target； scanning the portion comprising the scanning target to form a series of two-dimensional images with spatial location and orientation information； adjusting the initial three-dimensional structure of the scanning target or the local portion of the scanning target； when the initial three-dimensional structure is scanned over, then performing adjustments according to an image obtained and displaying on a display device. The method and system only require some initial three-dimensional information of an imaging target to be able to use two-dimensional imaging to continuously scan a location of a scanning target, adjust an original shape of the target to obtain an actual size, position, and detail of the target, and form a complete three-dimensional image of the target.
