我国神舟号飞船四次无人飞行试验都获得了成功。这些无人试验是为今后上真人铺平道路的。载人飞船要在绝对可靠,万无一失的情况下才能升空飞行。苏联“东方”号载人飞船上天之前,人们用各种生物火箭进行了31次动物飞行试验,并进行了7次(美国是8次)带有动物及生物培养试验的无人飞船的飞行试验。 China's Shenzhou spacecraft four unmanned flight tests have been successful. These unmanned tests are paving the way for real people in the future. Manned spacecraft to flight in absolute confidence, foolproof circumstances. Before the soviet “Manchurian” spacecraft was put on the sky, people conducted 31 animal flight experiments with various biological rockets and carried out flight tests of unmanned spacecraft with animal and biological culture experiments for 7 times (8 times in the United States) .