In this paper, three kinds of high density polyethylene(HDPE) of small hollow polyethylene 5831D, BL3 and BM593 produced using titanium-based catalysts were taken as raw material, are studied in depth in combination with the characteristics of three different reactor configurations: Three-reactor cascading, double-reactor cascading, and double-loop reactor systems. Firstly, through a physical property analysis of 5831D, BL3, and BM593, the paper explores their polymerization performance and product characteristics under various reactor configurations. Subsequently, a comparative analysis is performed using techniques such as differential scanning calorimetry and capillary rheometry to characterize and contrast the three raw materials. The research reveals differences in molecular structure, molecular weight distribution, and melt properties among the HDPE products produced in different reactors. For instance, 5831D from the three-reactor cascading system exhibits lower melt flow rate (MFR) compared to BL3 from the double-reactor cascading system, but it possesses a more complex molecular structure, contributing to an enhanced M_w of the product. The molecular weight distribution of products from different reactors varies, with the three-reactor system yielding a broader distribution, which is more conducive to processing. Additionally, the study encompasses tests and analyses related to product melt properties, crystalline performance, thermodynamic characteristics, shear-thinning viscosity, and more. Through systematic experiments and analyses, the paper elucidates the advantages and disadvantages of these three processes in the production of small hollow polyethylene. The research results not only provide guidance for optimizing the production process of small hollow polyethylene but also offer valuable insights into the synthesis mechanism of HDPE.