The Delta strain is a mutant strain of the New Coronavirus that was first discovered in India. The Delta strain has a greater ability to spread, infect, and spread faster than the earliest strains of NIV. The proportion of patients infected with the delta strain who turn out to be severe or even critically ill is significantly higher than that of the initial neocoronavirus, but the incubation period and the time between transmissions are significantly shorter. After the emergence of infection with the delta strain, symptoms are similar to those of neo-coronavirus infection and may include malaise, sore throat, muscle aches, fever, olfactory disturbances, and early clinical manifestations such as dizziness, headache, abdominal pain and diarrhea. Therefore, if there is a history of exposure to a deltavirus-infected person with similar symptoms as described above, it is recommended to explain the situation to the relevant institution with good isolation and prompt nucleic acid testing to clarify the presence of infection. However, there is no evidence that the delta strain has shown signs of increased lethality. The transmission routes of the delta strain are still respiratory, contact and airborne, and the killing methods are similar to those of the new coronavirus, with heat, ultraviolet light and alcohol being effective. The vaccination against New Coronavirus can also reduce the chances of patients who have already developed the disease turning to serious illness and death. Therefore, the public can not be too panic, timely vaccination, and good protection can be. Wear a good mask for daily travel and pinch the metal strip above the mask to make it fit well on the face. Avoid excessive contact with public facilities, avoid crowd gathering, keep a safe social distance from others, wash hands and disinfect regularly after going home, etc.