<p>The carbon fiber needled composite material uses the needled preform as the reinforcing phase and has extremely excellent properties. Current research has revealed the basic relationships among the needling process parameters, porosity, and the properties of carbon fibers. However, these studies have not made in-depth observations of the sliding tendency of fibers between the composites during the needling process, as well as the generation and variation trends of pores. Especially, the research on the needled preform is still far from adequate. The internal structure of the carbon fiber preform is extremely complex. Structural characteristics such as diverse fiber morphologies and random fiber distributions have not been fully studied. In the research on the key structural characteristics inside the preform, there is a lack of an effective means to comprehensively, deeply, and accurately parameterize and characterize the internal structure. This defect prevents us from having an in-depth understanding of the preparation and performance optimization processes of the carbon fiber preform, and also makes it impossible to provide accurate predictions and guidance for its performance in practical applications. In view of this, this study conducts parametric modeling of the needled carbon fiber preform, analyzes the internal structure of the preform and performs parameter characterization, constructs a finite element model to study its needling behavior, studies the dynamic behavior of the fibers inside the preform, and analyzes the influence of density on the needling behavior.</p>