The acceleration switch is a kind of inertial device that can sense impact acceleration and output on-off signal.The micro acceleration switch is fabricated by MEMS technology.The preset switch threshold is much less than it should suffer from the environmental impact.Survival becomes a big problem when the micro acceleration switch itself is subjected to high impact acceleration.Failure principle of devices under high impact is analysed.Three kinds of shield methods are presented in some respects of material

structure and package

such as adopting the tough metal instead of the brittle silicon to fabricate the switch chip

adopting buffer material to wrap the switch chip and leading wire

adopting the stainless steel to fabricate the package shell structure.The shield problem is solved via the three kinds of methods.Test shows all kinds of shield methods are effective.