An　electric　conductivity　probe　was　designed　to　study　local　void　fraction　of　gas-liquid　two-phase　flow　in　a　rectangular　helically　coiled　channel.　Reliability　of　the　electric　conductivity　probe　was　verified　by　measuring　length　of　Taylor　bubble　at　various　gas　superficial　velocity　and　by　comparing　it　to　visualization　measurement.　A　suitable　threshold　value　was　determined　for　signal　processing.　Effects　of　liquid　and　gas　superficial　velocities　on　local　void　fraction　distribution　were　investigated　at　three　regimes　of　bubbly,　slug　and　annular　flow.　The　experimental　results　show　that　local　void　fraction　distribution　of　gas-liquid　two-phases　in　helically　coiled　channel　is　asymmetric　parabola,　which　the　asymmetry　is　dependent　on　flow　regime　and　liquid　superficial　velocity.　©　2018,　Science　Press.　All　right　reserved.