The ideal spatio-temporal database not only has the normal functions essential to every spatial database, but also has
the ability for keeping track of dynamic data changing with time. Some analyses based on spatio-temporal database,
such as spatial network analyses based on different timestamps, should firstly do efficient querying work. With the
convenience and improvement in tracking of moving objects, trajectroy can be easily recorded and many novel
services have been proposed. So we should provide an efficient technique to finish trajectroy query on moving
objects. In this paper, we focus on improving the existing trajectory query. Firstly, this paper states the current
research approaches of dynamic query in spatio-temporal database. Secondly, it gives a classification of current
query methods and a description of the trajectory representation. Based on the foregoing groundworks, we propose
our improved methods and give an example to set forth the advantage of the method in details. Finally, we look
ahead and propose a new vista of research in this area.
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