Wound repair surgeries are the most common childhood surgery in most countries. Medical treatment itself will impact children's mental health. The authors' objective was to study the impact of parental presence in preschool children and to reveal the conditions and precautions of it. Parental presence during facial trauma surgeries was analyzed, a group of 49 preschool children from April 1, 2013 to April 30, 2013 and their parents attended the experiment, contrasting with a group of 57 preschool children without parental presence. By means of clinical observation and questionnaire, the wound infection rate, surgery satisfaction, children and parents' anxiety level were studied. The authors found that parental presence would not increase the Infection rate. Parental presence could reduce children's and their parents` anxiety level and increase the surgery satisfaction rate. Parental presence has a lot of positive significances about the children's emergency surgery, children's health care and parents' anxiety.