The effects of loading resistor on the self deflection of screening, photovoltaic and screening-photovoltaic solitons are investigated by use of the universal theory of steady state one dimension photorefractive spatial soliton . Results show that the three kinds of soliton with or without a loading resistor have a similar character in self deflection, i.e., the solitary beam center moves on a parabolic trajectory. The bending distance of these solitons can be adjusted by changing the resistance of the loading resistor. The bending range of bright SP solitons can be adjusted more broadly than those of the other two.