The vertical drainage plate is normally applied in vacuum preloading method for the treatment of blown filled mud and the volume compaction ratio can be as high as 30%～40%.However,the drainage plate has serious deformations in this approach.This leads to the fact that vacuum degree in the drainage plate significantly decreases with the increase of depth.In this study,contrast tests were conducted to investigate the application of horizontal drainage plate in vacuum preloading method.The results show that physical and mechanical properties (e.g.,settlement deformation,pore water pressure variation,water drainage amount,water content,vane shear strength,etc.) obtained by horizontal drainage plate are better performed than those by applying the vertical drainage plate.In addition,the advantages of employing horizontal drainage plate to blown filled mud treatment are analyzed.It is feasible to apply vacuum preloading method to blown filled mud with the horizontal drainage plate.