Based on the hydrotaxis and annual activity regularity of the subterranean termites,the influence of the relative humidity in bait box and luring period on the trapping effect was studied. The relative humidity inside the bait box( Ai) and luring period( Bj) were divided into 3 and 9 levels respectively.The influence of the two factors( Ai,Bj) on the feeding of subterranean termites lured and the influence of factor Aion the mortality of subterranean termites trapped were tested in woodland and grassland of...