Abstract: Eggs of Chinese native brine shrimp, Arteinia salina, were carried by satellite "8799". The total dose of ionizing radiations received by the eggs during 8-day spaceflight was about 169 mrad. The flown eggs started to be incubated in artificial sea water and observed, along with ones of the lab control and the launching-site control groups, on 21st-29th, 96th and 155th days after accomplishment of the flight. The main results are: (1) it was observed again that significant delay of emergence and hatching occurred in flown eggs and the extent of this delay appeared to have reduced gradually during prolongation of the egg storage at 42C; (2) the hatching rate of flown eggs and the survival curve, within 21 days, of larvae hatched from flown eggs were very similar to those seen in the earth control groups; (3) in the on-earth experiments of simulating super-gravity (up to 160 g), we didn't find any obvious effect on development. The necessity of two control groups (one kept in lab and the other sent to launching-site) parallel with the spaceflight samples was emphasized, and the importance of the effect of micro-gravity in the spaceflight was presumed.