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Coherent superposition of electronic states induces attosecond electron motion in molecules.We theoretically investi-gate the strong-field ionization of this superposition state by numerically solving the time-dependent Schr(o)dinger equation.In the obtained photoelectron momentum distribution,an intriguing bifurcation structure appears in the strong-field holo-graphic interference pattern.We demonstrate that this bifurcation structure directly provides complete information about the status of the transient wave function of the superposition state:the horizontal location of the bifurcation in the momen-tum distribution reveals the relative phase of the involved components of the superposition state and the vertical position indicates the relative coefficient.Thus,this bifurcation structure takes a snapshot of the transient electron wave packet of the superposition state and provides an intuitive way to monitor electron motion in molecules.