Silk waste of 6-9 kg per month has been discarded from a silk factory. Since silk fiber is expensive, as 800-1800 baht perky, the value addition of silk waste is of interest. In this investigation, silk waste as staple fiber was wearied one colored filament yarn was cut into 2 cm and 2 inches and boiled in distilled water and sodium carbonate solution of 0.5, 1 and 1.5 % w/v for 15 and 30 min at 80 °C then the staple fiber was combed and spinned. The result showed that staple fiber treated in 1.5 % w/v sodium carbonate at 15 and 30 min was easily combed and 2 inches fiber could be pinned as spun yarn. Different colors of silk fiber will be mixed and treated in the same manner to study the appearance of spun yarn.