Abstract: Thecodiplosis japonensis mainly damage Lodgepole pine, Pinus densiflora, Tabulaeus pine and Loblolly pine, as a new invasive species, there is an urgent need for effective forest identification and monitoring techniques that are convenient for daily use census monitoring, to understand the scope of its main occurrence in Huangdao district. Trapping adults with yellow sticky trap can not only reduce the population density, but also clarify the emergence period of adults, which provides a theoretical basis for chemical control. The results showed that the pine needle became shorter, the base expanded and formed galls, or long strip galls formed in the middle and upper part of the pine needle. There were brown spots on both sides of the gall, and the galls were significantly thinner than those at the base of leaf sheath. Since the beginning of August, there are many larvae in the gall, which can be used as a typical feature to identify the damage of T. japonensis in forest. When the yellow sticky trap was used to trap adults, there was no significant difference in the number of adults trapped in different hanging positions. When used to control adults in forests, the yellow sticky trap can be evenly distributed. June is the peak of adults emergence, and chemical control measures can be taken at this time.At the same time, the density of adults population can be effectively reduced by hanging yellow sticky trap before adults emergence and throughout the emergence period, thereby reducing the use of chemicals and being environmentally friendly. The hanging direction of yellow sticky trap has no significant difference in control effect, and can be evenly distributed in the forest.