Support base for a child safety seat

A child safety seat assembly includes a support base, and a child safety seat arranged on the support base. The support base includes a shell body, a latch assembly operable to fixedly attach the shell body with an anchorage fixture of a vehicle, and a cushion structure coupled with the shell body, wherein the cushion structure is operable to allow a cushioned displacement of the shell body relative to the latch assembly when the child safety seat is subject to collision.