Ray-tracing simulation and simulating design for volume scattering integrated light guide plates are presented, with Monte Carlo sequential sampling method based on multiple Mie scattering theory. The effects of optical parameters, i.e. doped material, particle scale, concentration and geometrical structure of light guide plates, on the backlight performances, such as the output light intensity uniformity and illuminating angle, are considered, and primary verifying experiments and design evaluation are also presented. It is found that, the above parameters are sensitive and correlated, and plenty of optimizing simulation is necessary for light guide plate design scheme meeting practical demands. The uniformity of output light intensity is determined mainly by the deoped particle concentration, view angle by the light guide plate size and especially the scope angle of basal surface, and dispersion by the diameter of doped particle and refractivity, respectively.