Filament inlay is a manufacturing technology, which combines filament and inlay technology. Filament is a handicraft made of gold and silver, which is drawn into filaments, piled up on the base and woven. Mosaic is to embed gold and silver flakes on utensils and make exquisite and gorgeous jewelry with gold thread as thin as hair. The filigree mosaic works sold in the Forbidden City are all carefully crafted and genuine. As a representative of the ancient palaces in China, the Forbidden City has collected many precious cultural relics and artworks, including filigree mosaics. After professional appraisal and protection, the works have high artistic value and collection value.