通过脆延性双层模型 ,在满足相似要求的前提下 ,模拟了三种边界条件下的上隆与伸展。模拟结果表明 :两侧边界固定时 ,上隆能产生拱张断裂 ,然而它引起的侧向分流比较小 ,基本不能形成伸展 ;存在半开放或开放边界时 ,可以产生大规模的伸展 ,但伸展主要沿上隆早期产生的张裂进行 ,显然 ,上隆产生的张裂为后续伸展奠定了基础 ,同时上隆加速了延性层向开放边界方向流动 ,促进了伸展 ;另外 ,在上隆—伸展过程中普遍存在延性层被动上隆。这些实验结果说明 ,地幔主动上隆引起伸展是有条件的 ,需要边界条件的配合 ;被动上隆是普遍存在的 ,它是重力均衡作用的必然结果 Through the brittle ductility bilayer model, uplift and extension under three kinds of boundary conditions are simulated on the premise of meeting the similar requirements. The simulation results show that when the boundary between two sides is fixed, the uplift can produce arch fracture, however, the lateral shunt caused by it is relatively small and can not be extended basically. When there is a semi-open or open boundary, it can produce large-scale stretch, Mainly along the early Shanglong cracks generated, it is clear that the tension generated by the uplift laid the foundation for follow-up stretching, while the uplift accelerated the ductile layer to open the flow of the direction of the border to promote the extension; In addition, The ductile passive hyperplasia is ubiquitous in the process. These experimental results show that the mantle uplift caused by the initiative to uplift is conditional, requiring the cooperation of the boundary conditions; passive uplift is ubiquitous, it is the inevitable result of the role of gravity equilibrium