Disclosed are a fast planning system and method applicable to ablation therapy. The system comprises an input device (101), a calculation device (102) and an output device (103). The calculation device (102) acquires from the input device (101) an actual position of an ablation probe relative to a tumor and a boundary of the tumor, the quantitative relationship between an ablation range and ablation parameters of the ablation probe, and maximum ablation range parameters of the ablation probe. The system obtains the ablation parameters of the ablation probe by means of the calculation device (102) on the basis of the acquired information, outputs the ablation parameters by means of the output device (103), and obtains a revised planning suggestion. The present invention resolves the issue of incomplete ablation in a clinical ablation operation possibly resulting from deviation of an actual probe insertion position from a probe insertion position planned prior to the operation, and is conducive to achieving precision control over thermal dosage at a focal region and ensuring the effectiveness of ablation therapy.
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