Abstract: Based on a winding cycle of filaments,a calculating model was proposed for the fiber orientation(including axial,radial and hoop orientation) of a unit cell of prefabricated piece of the multidirectional filament winding with focus on investigating the relationship between the fiber volume fraction of hoop orientation,fiber volume fraction of axial orientation and the process parameters such as the initial filament winding radius,the filament winding angle,and the fiber diameter.The curves of their relationship were plotted.The filament winding angle when the fiber volume fraction of hoop orientation was equal to that of axial orientation was calculated.This will provide a sound theoretical basis for the structural design and process design of prefabricated piece of multidirectional filament winding.