Morphological characteristics and life habits of Carya illinoensis Arbela dea Swinhoe were observed and studied in the room inside and outside.The results showed that 1 year happened one generation of Arbela dea Swinhoe in Yangbi.The mature larvae in the trunk tunnel in winter.Early April to early May turn pupal，pupal stage was 10~15 d,Mid April to May the moth emergence occur.The female moth always laid eggs to the crevice and wound in stem bark,the hatching rate of the egg was 80% and egg stage was 16 d.In late April larvae began to hatch,had been taking to mid-november it gradually reduce activities,into the winter.