This report was prepared to find how warious tussah silk worm diets effect for the worm nutrition, its cocoon and reelability, Meantime, it was attacked the reeling effect of newly developed tussah cocoon cooking chemical, Tussah-lite. The results obtained are as followings. 1. The chemical composition of various diets were almost even, but Quercus acutissima Carrathers was the best from the nutrition point of view. 2. It was found that the more Calcium Oxalate, the better cocoon was formed, but Calcium Oxalate in the cocoon layer was found as almost same amount in case of different diet was fed. 3. It was also found that the more tannin, the better cocoon was formed, but the cocoon reelability was found as almost same in case of different diet was fed. 4. The cocoon reeling effect of newly developed chemical, Tussah-lite, showed 6∼7% silk yield from the tussah cocoon.