In order to study the preservation of paper cultural relics, raw material composition, production process and causes of disease, scientific research and conservation were carried out on the 1940 Guilin version of the Jiuwang Daily. The functional group structure of the paper fiber was analyzed using a Nicolet 8700 Fourier transform infrared spectrometer. The paper fiber was observed by a XWY-VI fiber measuring instrument to identify the fiber type; the VHX-1000E video microscope and field emission scanning electron were also used. JSM-6700F microscope was used to analyze the processing of the paper sample and the degree of aging and contaminants to determine whether it is filled or sized. On this basis, in the restoration, the traditional decoration technology and the wire mesh reinforcement technology are combined to protect the cultural relics. The restored cultural relics solved the matching of the missing parts, the wrinkles were flattened, the disease effects were removed, the strength of the paper was enhanced, and the original appearance of the cultural relics was restored, thereby improving the integrity and ornamentation of the cultural relics. Research provides better historical data.