Ascaris lumbricoides generally enters the human body by accidental ingestion of infective stage roundworm eggs, which hatch out as larvae in the small intestine, penetrate the intestinal wall and enter the lungs along with the blood circulation, and then enter the digestive tract along with coughing and swallowing to grow into adult worms. Ascaris lumbricoides eggs contact with the soil in the appropriate conditions to develop into rod-shaped larval eggs, in the larval eggs contaminated soil after playing and sucking fingers, eating raw unwashed vegetables and fruits, etc. can be infected. The larval eggs hatch in the small intestine and then penetrate the intestinal wall and enter the lungs through the blood or lymphatic circulation. After a week of development in the lungs, the larvae enter the respiratory tract, travel up the throat, and enter the digestive tract as the host coughs and swallows. Once back in the intestines, the larvae grow into adults. Therefore, good hygiene habits should be developed in daily life, pay attention to dietary hygiene, do not drink raw water, do not eat unwashed vegetables and fruits, maintain personal hygiene, wash hands before and after meals to avoid roundworm infection.