The Xiaoxiang Border Guard Company of a regiment in the border defense of the Shannan Military Subarea in Tibet is stationed on a snowy plateau with an altitude of more than 4000 meters. There is ice and snow all the year round, high cold and hypoxia, and the oxygen content is less than half of the plain area. During the Spring Festival, the company camp was snowed heavily, and the lowest air temperature dropped to minus 20 degrees Celsius, becoming a veritable "snow island". On the occasion of the reunion of thousands of families, the officers and soldiers once again embarked on the snow patrol road. Three recruits who had just come to the company from the company also participated in the patrol for the first time.