In order to know growing habit and emergence regularity of Grapholitha molesta and seek the best stage for controlling,the investigation of its emergence was needed and sex pheromone traps is a pollution free technology for its low cost and easy management.In fruit tree base of Jilin Agricultural University,investigation on the generations of Grapholitha molesta and related trapping technique was conducted in 2010.The result indicated the generation of Grapholitha molesta in Changchun was incomplete two generations.Green trap basin with 240 cm height can trap the maximal amount moths.