Landslide　geological　disasters,　common　and　worldwide,　feature　intermittency　and　enormous　destructive　power.　An　effective　numerical　model　for　such　disasters　helps　formulate　the　targeted　prevention　and　control　strategies　of　landslides.　Focusing　on　the　particle　flow　characteristics　of　landslide　movement,　this　paper　derives　an　expression　of　the　dynamic　friction　coefficient　of　shallow　landslides　based　on　the　μ(I)　model,　and　constructs　a　corresponding　framework　for　solutions　using　the　Smoothed　Particle　Hydrodynamics　(SPH)　method.　We　examine　the　significant　impact　of　particle　fragmentation　on　landslide　movement,　and　derive　a　relationship　of　its　basal　frictional　force　versus　grain　distribution　to　improve　the　model　by　applying　the　particle　fragmentation　law　based　on　its　potential　of　destruction.　This　model　is　verified　against　two　previous　studies　in　literature-classical　three-dimensional　slope　model　experiments,　along　with　a　sensitivity　analysis　on　its　parameters　related　to　particle　fragmentation　effects,　thus　laying　a　basis　for　further　study　of　landslide　disaster　prevention　and　control.　©　2024　Tsinghua　University.　All　rights　reserved.