Dynamic operations change the state of object in Spatio-Temporal Database （STDB）

which are the basic tools of STDB’s updating and maintenance

e.g.

insert

delete

modify. In this paper

we argue that dynamic operations of STDB is a bridge linking the change processes in the real world and their representation in STDB

and a change in the real world has one and only one dynamic operation to deal with the operand. From the object-oriented STDB management point of view

the oper- and of dynamic operations is a single object; the mutation between entities should be realized by the dynamic operations of several objects. Based on this cognition

the changes of single geographic entities and the identity-based changes in STDB are stud- ied at first

and a set of dynamic operations of STDB mapping the entities’change of the real world to their representation in STDB is presented

which include 12 dynamic operations. The mutation between several objects can be represented by a few operations in this set. All of these operations are implemented on Oracle objected-relational database

using Oracle’OO4O and VC6.0. We also use an example to illustrate how these Dynamic operations can be used to update STDB.