This　paper　describes　the　structures　of　the　±100kV　multi　gap　multi　channel　gas　switch.　The　self　breakdown　performance　of　ten　switches　is　introduced.　A　test　bed　for　synchronous　discharge　is　established.　Ten　switches　are　arranged　in　parallel,　and　then　the　synchronous　discharge　is　carried　out.　The　cases　with　different　switching　coefficients　are　analyzed.　Two　types　of　trigger　isolating　water　resistors　are　used　in　the　test.　The　experimental　result　indicates　that　110kA　output　current　with　100ns　rise　time　can　be　achieved　when　the　switches　are　filled　with　0.16MPa　nitrogen,　and　charged　to　±65kV.　©　2008　Institute　of　Fluid　Physics,　C.