Brittle deformation in shallow crust is generally characterized by a long tectonic history and complex geological features which result from interdependent parameters. Using similar initial conditions of sandbox model (pure quartz sand thickness: 15 mm, 10 mm, 10 mm and red quartz sand thickness: 1 mm), we investigated different geometry kinematics and evolution of a thrust wedge with various shortening velocities.Under high velocity(0.4~0.1mm/s), the thrust wedge shows strong shortening and deformation along the wedge back, which is characterized by piggyback imbricate-thrust structures. Under lower velocity(0.05~0.005mm/s), the thrust wedge is characterized by gentle deformation and piggyback imbricate thrusting at first, followed by out-of-sequence retro-thrusting and backward pop-up structure after a critical wedge has been achieved. In particularly, Under the lowest velocity(0.002mm/s) , the deformation is characterized by Pop-up structure. Due to the temporality of sandbox modeling under low shortening velocities (i.e., how to unravel the maximum likelihood, the most complex deformation process with a most effective time), the choice of an effective shortening velocity is vital for the mechanism sandbox model. Therefore, we suggest a suitable and low velocity range (0.05~0.005mm/s) can set down in most of our modeling.