A method for controlling scanning preparation includes: obtaining a first scanning protocol of a current CT examination, controlling a CT scanner to perform a scanning preparation for a first scanning series according to the first scanning protocol in case that there are one or more subsequent scanning series, controlling CT scanner to perform scanning preparations for the subsequent scanning series according to the first scanning protocol, where for each subsequent scanning series, the scanning preparation is performed during time interval between end of exposure of scanning series previous to the subsequent scanning series and starting of the subsequent scanning series and obtaining a second scanning protocol of next CT examination and controlling the CT scanner to perform a scanning preparation for a first scanning series according to the second scanning protocol.
