Microwave　ablation　therapy　has　become　an　important　method　for　tumor　treatment　in　recent　years.　The　temperature　and　the　coagulation　region　need　real-time　noninvasive　monitoring　to　ensure　the　safety　and　effectiveness　during　the　treatment.　The　authors　reviewed　the　ultrasonic　monitoring　methods　for　tumor　microwave　ablation　therapy　both　at　home　and　abroad.　In　addition,　the　authors　also　prospected　this　technique　in　the　future.　©　2009　Higher　Education　Press　and　Springer-Verlag　GmbH.