The　methods　of　monitoring　the　thermal　ablation　of　tumor　are　compared　and　analyzed　in　recent　years.　The　principle　method　results　and　insufficient　of　ultrasound　elastography　and　quantitative　ultrasound　imaging　are　discussed.　The　results　show　that　ultrasonic　tissue　signature　has　great　development　space　in　the　field　of　real-time　monitoring　of　thermal　ablation,　but　there　are　still　some　problems　such　as　insufficient　monitoring　accuracy　difficulty　in　whole-course　monitoring　and　insufficient　in　vivo　experiments,　so　it　is　impossible　to　realize　clinical　application.　It　is　necessary　to　further　study　the　monitoring　method　which　can　realize　accurate　and　real-time　detection　of　ablation　zone　and　transition　zone　and　can　be　easily　combined　with　the　existing　ultrasonic　equipment.