This report was prepared to check silk reelalility and its quality when the cocoon was cooked in nonpermeative condition after trotted with some chemical solution. The obtained results were as followings. 1. A new chemical, Serisol, was developed by the author to help silk reelability 2. The chemical cooking method showed 0.4％ increase of silk yield more than the normal silk reeling method. 3. The chemical conducted good cocoon cooking without permeative process. 4. This method showed better cleanness and neatness than the normal one. 5. This method did not damage the silk quality because of use Serisol. 6. The proper dilution of Serisol was found as 2000 times for it.