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Image-guided tumor ablation has characteristics as targeted, minimally invasive, safe and efficient. Therefore it is recognized and welcomed by the patients and doctors. Image-guided technology is the key to the success of tumor ablation. Traditional ultrasound, computed tomography, magnetic resonance imaging are the common image-guided technology. Traditional ultrasound is cheap and easy to operate. More importantly, it has no radiation and can achieve real-time monitoring. Computed tomography images have good density resolution and spatial resolution. So CT can display the structure relationships around the lesion. Magnetic resonance imaging has high spatial resolution and sensitivity to temperature changes, especially has the ability to distinguish soft tissues. In addition, certain new imaging technology such as elastography and image fusion technology also have been studied in recent years. In this paper, we discuss these image-guided technologies of tumor ablation.