[Objectives]  To investigate the frequency of occurrence of Egystia hippophaecolus (Hua, Chou, Fang et Chen) adults and the correlation between numbers of larvae and numbers of adults caught in sex pheromone traps. To provide baseline data for the establishment of"3S" and sex pheromone trap monitoring techniques. E. hippophaecolus is a wood-boring insect that damages shrubs. Its larval development can be divided into 16 instars, and it needs 4 years per generation in Liaoning province. [Methods]  We introduced each instar larvae to the roots of planted healthy seabuckthorn shrubs and monitored pupation and molting over a year to determine the final stadium. We used random sampling to determine the numbers of larvae in each sample and suspended pheromone traps to trap adults. Curvilinear regression analysis was used to develop an optimal model of the relationship between the number of adults trapped with sex pheromone baits in the current year and the number of larvae in different stadia. [Results]  12-16^th instar larvae mature in late May after which they burrow into the soil to pupate and molt into adults. There were three adult molting peaks in Jianping county, Liaoning province. The adult period was quite variable (76 to 95 days). In all regression equations there was a significant relationship between numbers of 13-16^th instar larvae and numbers of trapped adults; the highest R² values were obtained from the quadratic function, y=0.001x²+0.321x+38.783, R²=0.649, P<0.05. [Conclusion]  E. hippophaecolus larvae can pupate and molt into adults in Liaoning province. Adult periods were variable and there were three molting peaks. A mathematical model of the relationship between numbers of larvae and adults will be useful for using remote sensing technology to monitor the abundance of this pest.