The present disclosure provides a neutron capture therapy system. The neutron capture therapy system includes an accelerator, the accelerator generates a charged particle beam； a neutron generator, the neutron generator generates a neutron beam after being irradiated by the charged particle beam； a beam shaping assembly, the beam shaping assembly includes a moderator and a reflector surrounds around the outer periphery of the moderator, the moderator moderates the neutrons generated by the neutron generator to a preset spectrum, and the reflector leads the deflected neutrons back to increase the neutron intensity within the preset spectrum； and a collimator, the collimator concentrates the neutrons generated by the neutron generator； the spectrum of the neutron beams is changed by changing the spectrum of the charged particle beam.為了在中子捕獲治療過程中獲得多種能量範圍的中子射束以滿足在實際治療過程中需要的中子射束能譜，提供一種中子捕獲治療系統，包括用於產生帶電粒子束的加速器、經帶電粒子束照射後產生中子射束的中子產生部、射束整形體以及準直器，所述射束整形體包括緩速體及包覆於緩速體外周的反射體，所述中子產生部經帶電粒子束照射後產生中子，所述緩速體將自中子產生部產生的中子減速至預設能譜，所述反射體將偏離的中子導回以提高預設能譜內的中子強度，所述準直器將中子產生部產生的中子進行集中照射，在中子捕獲治療過程中，所述中子捕獲治療系統通過改變帶電粒子束的能量使照射至中子產生部而產生的中子射束的能量發生改變。
