Terahertz technology has shown broad application potential in security detection, medical imaging, and materials analysis, yet it still needs more power from sources and low detector sensitivity. With their non-diffracting and self-healing properties, Bessel beams have emerged as significant tools in optical manipulation. This paper employs the generalized Lorenz-Mie theory to systematically investigate the effects of terahertz Bessel beams on the near-field and far-field scattering intensity of dielectric particles. The results indicate that the order and polarization state of the Bessel beam significantly influence near-field jet phenomena, with noticeable bifurcation occurring particularly in higher-order beams. Compared to plane waves, the vortex characteristics of terahertz Bessel beams generate dual-beam jets. Far-field analysis reveals that scattering intensity decreases with increasing half-cone angle, with similar trends observed across different polarization states. This study provides theoretical support for optimizing terahertz technology applications in medical imaging, environmental monitoring, and quantum computing, holding important scientific and engineering significance.