In　order　to　enhance　the　photocatalytic　indoor　air　purifying　efficiency,　the　photocatalytic　technology　was　combined　with　non-thermal　plasma　to　improve　the　removal　of　indoor　air　contaminants.　The　experimental　results　show　that　the　removal　rate　of　formaldehyde　is　improved　sharply　by　plasma　and　photocatalysis.　The　removal　rate　of　formaldehyde　is　increased　with　the　increasing　of　excited　voltage　for　plasma　and　the　removal　of　contaminants　has　the　maximal　value　under　the　optimal　excited　voltage　in　this　paper.　So　the　combination　of　photocatalysis　with　plasma　is　an　applying　direction　of　photocatalytic　technology　for　air　purification.