The utility model relates to a thermosensitive optical probe. A method for guiding energy to tissues comprises the following starting steps: conforming the position and/or boundary of a target tissue; delivering energy to the target tissue by using a located ablation device, and locating one or more thermosensitive optical probes in a tissue region with a monitor. Each thermosensitive optical probe is suitable for the spectral characteristic of light response heat entering one or more optical fiber parts of the thermosensitive optical probe. The method also comprises the following steps: applying energy to the ablation device; continuing to ablate, and displaying the size and/or position of an ablation region with a threshold value heat dose on the monitor through at least one received electric signal, wherein the electric signal is generated by one or more thermosensitive optical probes; determining weather the ablation region on the monitor is larger than the boundary of the target tissue; stopping ablating if the ablation region on the monitor is determined to be larger than the boundary of the target tissue.