Exploring silicon-based spin modulating junction is one of the most promising areas of spintronics.Using nonequi-librium Green\'s function combined with density functional theory,a set of spin filters of hydrogenated zigzag silicene nanoribbons is designed by substituting a silicon atom with a boron one and the spin-correlated transport properties are studied.The results show that the spin polarization can be realized by structural symmetry breaking induced by boron doping.Remarkably,by ttming the edge hydrogenation,it is found that the spin filter efficiency can be varied from 30％ to 58％.Moreover,it is also found and explained that the asymmetric hydrogenation can give rise to an obvious negative dif-ferential resistance which usually appears at weakly coupled junction.These findings indicate that the boron-doped ZSiNR is a promising material for spintronic applications.