Two types of silica gel supported metallocene catalysts, cat1 and cat2, with different aluminum zirconium contents, were prepared using polymethylaluminoxane (MAO) and bis (n-butylcyclopentadienyl) zirconium dichloride as metal sources and activated silica gel as carriers. The chemical composition and particle size distribution of cat1 and cat2 were characterized using FTIR, laser particle size analyzer, inductively coupled plasma emission spectroscopy (ICP-OES), and other methods. The effects of polymerization temperature and time on the catalytic activity and viscosity average molecular weight (Mv) of polyethylene were investigated using slurry polymerization, and the entanglement degree of polyethylene prepared by catalysts was characterized using DSC and rheological analysis. The results showed that the Al and Zr mass fractions of high metal loading cat1 were 21.26% and 0.70%, and the Al and Zr mass fractions of low metal loading cat2 were 7.37% and 0.20%. There were significant differences in the kinetics of catalytic ethylene polymerisation between cat1 and cat2 with different metal loadings. At polymerization temperatures of 70 and 60 ℃, the catalytic activity of cat1 and cat2 for ethylene polymerization reached 9200 and 5140 g (PE)/g (cat), respectively. The Mv of the prepared polyethylene was 3.20×105 and 3.70×105 g/mol, respectively; cat1 had relatively stable catalytic activity for ethylene, long catalyst life (8 hours), and overall high activity; The low Mv resin prepared by cat2 exhibited significant entanglement removal properties. Meanwhile, the entanglement degree of the resin increased with the increase of Mv.