The　washcoat　deposited　on　a　ceramic　honeycomb　was　prepared　with　modified　γ-Al2O3　and　pseudo　boehmite.　The　effect　of　gel　solid　content　on　the　gel　viscosity　and　coating　ability　was　investigated.　The　monolithic　catalysts　were　made　with　noble　metal　being　active　component,　cordierite　and　modified　γ-Al2O3　being　the　first　and　second　carriers.　The　effects　of　Pd　content　and　deoxidation　on　the　monolith　catalyst　performance,　the　effects　of　the　cyclic　period,　and　preheated　temperature　on　the　operation　performance　of　reactor　were　investigated.　Result　show　that　the　quantity　supported　Pd　of　coating　layer　being　1.5%　and　the　coating　of　solid　content　being　20%　was　the　best.　The　methane　conversion　attained　85%　when　the　catalyst　preheat　temperature　was　450℃,　space　velocity　was　15　000　h-1,　and　reversing　cycle　was　10　min.