A method and a device for tracking a contrast medium by scanning are provided. The method includes: obtaining a relationship between a contrast medium concentration and time according to concentration values of the contrast medium obtained by previous scannings predicting a time interval from a current time point to a time point when a target concentration value reaches according to the relationship between the contrast medium concentration and time and starting a routine examination at the end of the time interval. In the present disclosure, a routine examination may be performed in time.
