Abstract: On the basis of theory of three essential circuits elements, this paper presents a universal synthesis of bipolar circuits. The generalized binary signal to be applicable to voltagemode and current-mode circuits is introduced first. Then the simplified theorem on origin signal and load is proved, which is used for anlayzing the structure of any unit circuits, for deducing the relevant expression in component stage and for finding out a new manner to realize TTL and ECL circuits. In accordance with the above theory a new low voltage TTL circuit and multimeitter ECL circuit in component stage are found out. The above theory is proved to be correct through experiments on circuits.