Abstract：With the use of both principle and method of balanced section，the tectonic evolution of Dongpu depression was studied，and the tectonic movement was analysed carefully. The study and analysis led to the following conclusions:·The generation and tectonic evolution of Dongpu depression were controlled by both basement tectonics and basement faulting.·Tectonic evolution involved six phases..The south part of Dongpu depression is wider than its north part because the south tensional force was more powerful than the north tensional force.·The detachment surface is not deep，and basement subsidence in south part was greater than that in north part..The south part of west depression has deep detachment surface and high structure amplitude，so it is a favourable area for hydrocarbon exploration.
