Welan　gum　modified　polyurethane　(WMP)　with　different　welan　gum　concentrations　were　synthesized　at　vacuum　conditions.　The　average　pore　diameter,　porosity,　pore　volume,　contact　angle,　pore　morphology,　oil　adsorption　ratio　and　absorption　energy　of　WMPs　were　investigated　by　nitrogen　adsorption　analysis　(NAA),　scanning　electron　microscope　(SEM),　energy　disperse　spectroscopy　(EDX),　and　molecular　simulation.　The　results　demonstrated　that　pore　structure　is　highly　dependent　on　the　welan　gum　content.　Moreover,　the　number　of　dead-end　pores　in　the　WMP　decreased　more　compared　to　inter-connected,　passing,　and　closed　pores.　Simulation　results　showed　that　the　adsorption　properties　of　WMP　increased　with　the　increasing　welan　gum　content　at　a　certain　level.　Welan　gum　could　change　the　pore　shape　and　improve　the　irregularity　degree　of　WMP.　The　gel　shrinkage　also　improves　in　spite　of　the　hydrogen-bonding　interactions.　The　two　parameters　of　Langmuir　isotherms　are　42.68　mg　g(-1)　and　0.0245　l　mg(-1),　respectively.　The　gasoline　adsorbability　of　WMP　is　smaller　than　that　of　diesel.　Consequently,　welan　gum　could　improve　the　adsorption　heat　and　the　adsorbability　of　polyurethane.