Based on the relationship among the geographic events

spatial changes and the database operations

a new automatic(semi-automatic) incremental updating approach of Spatio-Temporal database(STDB) named as Event-Based Incremental Updating(E-BIU) is proposed in this paper.At first

the relationship among the events

spatial changes and the database operations is analyzed

then a total architecture of E-BIU implementation is designed

which includes an event queue

three managers and two sets of rules

and each component is presented in detail.The process of the E-BIU of the master STDB is described successively.An example of incremental updating is given to illustrate this approach at the end.The result shows that E-BIU is an efficient automatic updating approach for master STDB.