It is generally acknowledged that geomagnetic polarity has reversed many times in geological history and an abnormal geologic phenomenon is the Cretaceous normal superchron (CNS). However, the causes have been unknown up to now. The nonlinear theory has been applied to analyze the phenomenon in geomagnetic polarity reversal and Cretaceous normal superchron. Cretaceous Normal Superchron implies that interaction of earth core-mantle and liquid movement in outer core may be the lowest energy state and the system of earth magnetic field maintains a sort of temporal or spatial order structure by exchanging substance and energy in outside continuously. During 121～83Ma it is a cause of occurring Cretaceous normal superchron that there is non-dynamic effect of a collision with a celestial body which bring a geomagnetic polarity reversal. Random of reversal geomagnetic polarity has the self-reversion characteristic of chaos and Chaos theory gives a simple and clear explanation for the dynamic cause of geomagnetic polarity reversal.
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