Abstract: The new mulberry variety-Chuan 826 which have stably hereditary, high yielding, high quality and so on was bred by Sericultural Research Intitute of Sichuanis. In 2000, it became the key race of the "tenth five years" major item "breeding high quality and high yielding mulberry and silkworm varieties. From 2002 to 2004, the comparative experiments were carried on in Leshan, Santai and the Sericultural Research Intitute of Sichuan Province, the reproductive test was performed in Pengan of Sichuan Province. Compared to "Husang 32", the test results show that the yield of mulberry leaves increased by 13.95%, cocoon weight per 10 000 larvae increased by 8.88%, cocoon shell weight per 10 000 larvae increased by 8.8%, cocoon yield of 50 kg mulberry leaves for 5 instars increased by 13.51%, cocoon yield in 667 m2 increased by 28.2%, coccon shell weight in 667 m2 increased by 27.6%. Raised by the mulberry leaves of Chuan 826, eggs of the signal moth increased by 6.87%, normal eggs of the signal moth increased by 5.63%.