7 new sericinjams are in breeding by the hybridization of silkworm genetic resource, that is, ND strain and the parent silkworm, and the feature of new sericinjam was classified by a cocoon color. According to cocoon color, sericinjam showed two kind of color including the light green and yellow. D601, D704 and D707 with the light green silk were a difference to density of color. Also D703, D705, D751 and D752 with the yellow silk showed a difference to density of color. As investigating the pupation rate which means the healthiness of the silkworm, D601 was highest with 93%, and D703 was lowest with 65.6%. The ratio of the sericin silk showed some difference every breed, and D601 among them was highest with 91%. There is close correlation between sericin cocoon quantity and the dried silkgrand weight. The weight of the dried silkgrand for sericinjams which were compared with baeokjam was low about 2.5 ~ 7.9 times. Among sericinjams, D601 was lowest, and D707 was highest. The pure sericin content of sericinjams was an above 96%, and sericin content of per one cocoon was low 1.4 ~ 2.5 times than baeokjam. Blood of silkworm which makes the light green silk exhibited anti bacterial activity against Gram-negative bacteria.