plant garlic. Using 3-chloropropene as raw material, Diallyl trisulfide can be obtained after three-step reaction. This product can play an effective role in resisting Gram-positive and negative bacteria. It is 50% as potent as allicin and assumes the main antibacterial role in garlic oil. It has inhibitory effect on Candida albicans, Cryptococcus rubrum and Cryptococcus in vitro. Clinically, it can be used to treat deep fungal infections, mixed fungal infections and various intestinal diseases. It has an effective rate of 80% to 90% for respiratory tract, digestive tract, meningitis, intestinal tract and other diseases, and has very little side effect.