The　persistent　photoconductivity　of　organic　material　PDVT-10　combined　with　the　polarization　field　provided　by　ferroelectric　material　P(VDF-TrFE),　was　used　to　control　the　relaxation　characteristics　of　the　photosynaptic　device　by　adjusting　the　polarization　intensity　of　ferroelectric　material.　The　basic　functions　such　as　short-term　plasticity　and　paired　pulse　facilitation　of　synapses　are　simulated,　and　the　multilevel　dimmable　optical　synapses　are　further　realized.　Moreover,　the　relaxation　phenomenon　of　continuous　photoconductance　effect　is　similar　to　the　flow　characteristics　of　Ca2+　in　biological　synapses,　which　can　better　simulate　the　synaptic　behavior　of　biological　synapses.　This　study　provides　a　new　idea　for　the　development　of　adjustable　photosynapses.　©　2021,　Science　Press.　All　right　reserved.