Abstract: The insect pest is one of the most important limiting factors for the plant growth. The ecological control of agricultural and forestry pests is an important task at present. In this paper, a "cobweb" trap was made to imitate the principle of cobweb trapping. The relationship was studied between the number and species of trapped insects, the time of trapped insect on the "cobweb" trap, the way of insect pests on the "cobweb" trap and its net diameter. The results showed that while the "cobweb" trap coated with 1 mm glue and the net aperture was 1 cm×1 cm, there were the most trapped insects on the "cobweb" trap. The size of the net could be adjusted to catch the insects of a certain size efficiently. By combining the "cobweb" trap with the insect attractant, the directional and efficient trapping of specific insects could be realized. The "cobweb" trap was simple to operate, time-saving and labor-saving, and had an important practical application value.