▎ 摘　　要

We examine the collapse of Landau levels in graphene under uniform uniaxial strain and in the presence of a pair of crossed homogeneous electric and magnetic fields. In particular, we obtain the Landau levels and examine their dependence on the strain ?E reaches a critical value E-c whose magnitude can be increased (decreased) by applying the strain in the zigzag (armchair) direction. We also examine the phenomena in the presence of crossed inhomogeneous fields.