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.