Abstract: Tests of biological activities of three treatments ,treated female(T♀)mated with treated male( T♂)?treated female mated with untreated male(U♂)?untreated female(U♀)mated with treated male,with Diflubenzuron(DFB) to adults Apriona germari Hope,and offspring egg hatching tests were carried out in laboratory .Test results show that the DFB shortens the longevity of the adults about 6 to 7 days; the number of eggs laid per female of all treatments were reduced ,especially the T♂×T♀ treatment , egg production decreased by 28.71%; treated female adults with DFB, the hatching rate of offspring eggs was lowered significantly in comparison with control treatment ;DFB also prolonged the incubation days of progeny eggs, in contrast to the control treatment, the egg stage were 12.38,11.93 and 11.64 days respectively.