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Mobile phone base station location data contains rich spatio-temporal information.A visual analytic method based on per call measurement data (PCMD) was designed.A base station positioning method based on PCMD to extract mobile phone users’ trajectories was designed.An agglomerate hierarchical clustering algorithm was improved to cluster trajectories efficiently.Flow map and heat map were employed to present the clustering result and the overall distribution of mobile phone users at a specific time.This method was applied to the dataset of Shanghai mobile phone base station data,which has achieved satisfied results.