A semi-analytical and semi-numerical calculation is used in single spherical colloidal particles in a nonelectrolyte solution, to calculate the diffusiophoresis velocity without considering the solute convection effect of fluid inertia. The fixed value of the concentration gradient to a parallel plate is the driving force. The boundary conditions for plate can be a solute linear distribution of the two situations that cannot penetrate or solute. When the particle radius is much larger than the thickness of particles and solute interaction layer plate, one part of the boundary effect is from the interaction effect produced by the concentration gradients and the colloidal particles, while the other part is from the viscosity of the fluid. The mobility velocity boundary is used to take point velocity under different polarization parameters and separation parameters to verify the reflection method. Due to the surface characteristics of the particles and the relative distance of the plate from the different boundary conditions on the plate, the plate effect can reduce or increase the motion velocity of particles.
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