Abstract: The biological characteristics of Halyomorpha picus Fabricius and Erthesina fullo Thunberg were studied systematically from 1989 to 1991. The results show that in the central and southern part of Hebei Province, H. picus has 1~2 generations and E. fullo only 1 generation a year. Both of the stinkbugs are awaken from the early ten days of April to the middle ten days of June and began to overwinter from the late ten days of August to the late ten days of October. The average life span of the overwintered adult of H. picus is 301 days, that of E. fullo is 328.5 days and the first generation of H. picus 31.6 days. The hosts of the two stinkbugs are Paul-ownia spp., Pyrus bretschneideri Rchd., Prunus persica (L.) Batsch, Malus pumila Mill and Populus spp. etc. There is a great difference in population density in the same period with different hosts or in the same host with different period. As for the dispersal distance, H. picus can fly 2 km and E. Julio 3 km. And the amount of oviposition, life cycle, damage habit and natural parasitic insects, etc. were also studied. Based on the biological characteristics, new control method and integrated management were suggested.