A kind of method, for determining that the fluid cooled microwave ablation system of situation is provided including providing an electric current to pumping, pumping fluid is used to cool down along fluid path ablation system by ablation system, and measurement is pumped by Current draw, with determine ablation system state, based on measured electric current. In another aspect of the disclosure, it includes that ablation probe defines that fluid path flow-through fluid passes through that ablation system, which provides, a kind of generator, energy is configured to supply for ablation probe in processing tissue, pump is configured to pumping fluid and passes through the ablation probe of fluid channel to cold ablation probe, sensor, measurement is configured to be pumped by Current draw, and computing device, to determine the state of ablation system, based on measured electric current.
