Transgenic technology is a kind of risky technology.Its intensive applications,on one hand,result in huge unease and anxieties;on the other hand,bring about political and ethical debates globally.The ethical debates mainly involve such principles: benevolence,no harm,autonomy,justice and respect for nature.Appeal to those principles leads to contradictory practical implications and thus puts people in predicament.The solution to this predicament is to prioritize these ethical principles,and take precautionary principle as the ethical guideline for policy-making correspondingly.