<;P>;PROBLEM TO BE SOLVED: To provide a method for restoring a cell surface protein in the field of biology and medicine. <;P>;SOLUTION: A cell is cultured for a predetermined period of time at a temperature range in which the hydration force of a polymer is weak to allow a cell surface protein to be restored on a cell culture support material coated on the surface with a polymer in which the hydration force is variable at the temperature range of 0-80 °;C, and after that, the cultured cell can be removed by allowing the temperature of the culture solution to change so that the hydration force of the polymer becomes strong. <;P>;COPYRIGHT: (C)2008,JPO&INPIT