Abstract: Objective: To investigate infectious status of demodicid mites and analyze relevant factors.Methods: The demodicid mites samples were collected with transparenttape method.The family background,individual health habit,types of facial skin and facial dermatitis of 298 soldiers of the army stationed in Bengbu were surveyed by using questionnaires.Results: The total infection rate of demodicid mites was 23.83%.The infective rate in those suffering from rosacea,folliculitis or seborrheic dermatitis was higher than that in the normal ones(P<0.05);The infective rate of the soldiers who joined the army earlier was higher than the others(P<0.005);The infection rate in the soldiers who often shared toilet articles with others was higher than those who did not(P<0.005);The infective rate in the soldiers who washed face one or two times of a day was higher than who washed face three times of a day(P<0.005);There was no statistic significance in many aspect,including coming from city or countryside,disparity in age section,coming from south or north province,raising pet or not.Conclusions: Individual hygienic habits,facial dermatitis,the time of joining the army and living conditions are associated with demodicid mites infection,but without connection with the family background,age and raising pet.