The present disclosure provides a neutron capture therapy system including a beam shaping assembly. The beam shaping assembly includes a beam inlet； a neutron generator arranged into the beam shaping assembly, the neutron generator has nuclear reaction with an incident proton beam from the beam inlet to produce neutrons； a moderator adjacent to the neutron generator, the neutrons are moderated by the moderator to epithermal neutron energies； a reflector surrounding the neutron generator and the moderator, the reflector leads the deflected neutrons back to enhance epithermal neutron beam intensity； a beam outlet； and at least a movable member moving away from or close to the neutron generator, wherein the movable member moves between a first position and a second position, when the movable member is at the first position, the neutron generator is replaceable； and when the movable member is at the second position, the neutron generator is irreplaceable. The neutron generator is easy to be replaced. The neutron capture therapy system has a simple structure, and is flexible to use.一種中子捕獲治療系統，包括射束整形體，其包括射束入口、設於射束整形體內的中子產生部、鄰接於中子產生部的緩速體、包圍在緩速體外的反射體及射束出口，中子產生部與自射束入口入射的質子束發生核反應以產生中子，緩速體將自中子產生部產生的中子緩速，反射體將偏離的中子導回至所述緩速體以提高超熱中子射束強度，射束整形體包括至少一個能夠向遠離或者靠近中子產生部方向運動的活動件，所述活動件具有第一位置和第二位置，所述活動件在該第一位置和第二位置之間運動，當活動件位於第一位置時，中子產生部能夠被更換；當活動件位於第二位置時，中子產生部不能夠被更換。本申請中子產生部更換方便，結構簡單，運用靈活。
