演绎推理是以认定的案件事实和既有的法律规则为前提进行的推理,在刑事诉讼中表现为肯定前件或否定前件式的充分必要条件假言推理,在民事诉讼中则表现为肯定前件或否定前件式的充分条件假言推理。尽管国内外学界对演绎法律推理多持批判甚至否定的态度,但由于其具有较高程度的确定性和客观性,有助于实现形式正义和法治,防止司法专横和腐败,演绎推理应是我国法律推理的主要模式。 Deductive reasoning is based on the facts of the case identified and the existing legal rules as the premise of reasoning in criminal proceedings appear as a positive antecedent or negative antecedent of the necessary and sufficient conditions for the hypothesis of reasoning, Sufficient conditions for antecedent or antecedent preconditions. Although scholars both at home and abroad hold a critical or even negative attitude toward the deduction of legal reasoning, because of its high degree of certainty and objectivity, it helps to achieve formal justice and the rule of law and prevent judicial arbitrariness and corruption. The main mode of legal reasoning.