Abstract: In order to obtain the behavior of evolution and self-deflection of two-photon separate screening-photovoltaic soliton pairs,the dynamical evolution,stability and self-deflecton of both solitons in separate dark-dark and bright-dark soliton pairs in a biased serial two-photon photorefractive crystal circuit were simulated.Under the limit conditions the optical wave has a spatial extent much less than the width of the crystal,only the dark soliton can affect the dynamical evolution and stability of the other soliton with the help of light-induced current,but the bright soliton cannot.For a bright-dark soliton pair,the deflection angle of the bright soliton decreases with the increase of the input intensity of the dark soliton.