The basement were controlled by faulting, and the depth depressing gradually from north to south.The north side was the center of the subsidence, and on the edge of the basin the faulting is evident.

• 盆地基地受断裂活动(乌拉山、大青山山前断裂)控制，总体呈北深南浅的萁状构造特征，沉降中心位于盆地北侧，盆地边缘活动断裂标志明显。