Abstract: Objective Trajectory processing and analysis are research issues in several related fields,such as geog-raphy,and database design.Inspired from the Stop/Move abstraction model of a trajectory,this pa-per explores the spatio-temporal relationships among trajectories by analyzing the spatio-temporal traj-ectory patterns and their relationships.Firstly,a spatio-temporal association Stop/Move Model,based on the Stop/Move conceptual model,is introduced to link trajectory with rich geographical in-formation;Next,trajectory spatio-temporal patterns,describing the trajectory movement of an agentwith respect to given geographical feature,are presented;Finally,the relationships between the spa-tio-temporal patterns of trajectories are discussed:Stop-Stop,Stop-Move and Move-Move.The po-tential application capabilities of this paper on trajectory relationship queries and analysis are also dem-onstrated through two typical examples.