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Amyloid β42 (Aβ42) aggregation plays a key role in the pathogenesis of Alzheimers disease.However, the morphology and structural dynamics in different stages of Aβ42 assembly are not well known.To investigate the dynamic properties of morphological and structural changes in the aggregation process of A(3 in vitro, transmission electron microscopy, western blot analysis and circular dichroism were used to observe the changes in morphology, immunoreactivity and secondary structure during Ap aggregation, respectively.Results demonstrated that at 24 hours following Ap42 aggregation in vitro, the structures of spherical granules from 5 to 10 nm and coils from 20 to 30 nm were visualized by transmission electron microscopy.Different immunoreactivities of the oligomers and fibers were detected by western blot analysis.The dynamic changes of the a-helix to β-sheet were confirmed by circular dichroism spectra.The dynamic properties of the morphological and structural changes in the aggregation process of Aβ42 in vitro were analyzed,which contributed to the identification of stable conditions of Aβ42 oligomer formation.