The palace is to make a 150-cubic-meter refrigeratory to store nearly 20,000 volumes which were damaged by water in an accident on November 15.

Nearly 3,900 volumes of newspapers and periodicals in the languages of China's ethnic minorities, the most seriously destroyed in the accident, have been stored in a 15-cubic-meter refrigeratory after repairs.

So far the palace's heat and humidity preservation system has been recovered. The whole project will be completed in one or two years, said a palace official.