Abstract: There are many methods to extract boric acid from the boron-containing solutions.The ion exchange method is considered the one of the most promising methods.At present,the ion exchange agents are mostly specific boron ion exchange resins,but their heat-resistant ability is not satisfying.A hydrated cerium dioxide with better heat-resistant ability and larger absorption ability was studied.Its absorption and elution ability of boron in the hot brine was investigated and satisfying result was obtained.