In this paper the genaralized sequential machine with generalized input signals is the starting point for studying Dynamic sequential Circuits （DSC）. The dynamic unit circuits characteristic equation is derived by leading capacitor into network. According to the analogy of storaging information to capacitors and flip-flops

a unified theory of sequential circuits is set up to intergrating theory of convention sequential circuits and DSC. This paper shows the conditions for realizing or and deals with the equivalent transform between the different switch structures of DSC

pseudo-DSC and static sequential circuits in the light of practical example.