The stimuli-response of the radiation cross-linked hydroxypropylcellulose (HPC) gel was investigated. Temperature, pH and electric current (electric field) were changed in the experiments. The volume of the HPC gel was decreased as the water temperature rose from 20℃ to 50℃. On the other hand, the gel volume was increased with the decrement of the water temperature. The HPC gel volume grew large slightly at the high pH above 11. The volume phase transition of the HPC gel with the current change was not recognized in this experiment.