Abstract: Reichenbach’s logic of Reichenbach’s logic of frequency probability is constructed by removing the theory and practice of probability logic and mathematics logic into the logic of induction.In view of mathematics,it uses the concept of frequency probability of the theory of mathematical probability;in view of logic,it is an external,relative,and multi-valued logic.It is characterized by frequency explanation,which greatly puts forward induction logic into a research of form and quantity.It is the difficulties in its development that continuously revise and perfect its system.Reichenbach’s research into the logic of frequency probability indicates that modern science and technology are infiltrated with each other and they have the historical tendency of unification and integration.

Key words: Reichenbach, probability logic, frequency probability logic