Gully　erosion　has　been　identified　as　a　major　driver　of　the　formation　of　loess　surface　erosion,　and　the　development　process　of　the　gully　profoundly　affects　the　development　and　evolution　of　the　loess　landform.　In　this　study,　six　typical　geomorphological　plots　of　the　Loess　Plateau　were　selected,　and　the　digital　elevation　model　of　these　plots　were　used　as　the　basic　data　source　to　extract　the　gully　system.　The　weighted　complex　network　model　of　the　gully　in　the　Loess　Plateau　was　constructed　using　the　gully　nodes,　gully　source　points,　and　water　outlet　points　as　the　network　nodes,　the　spatial　topological　relationship　between　the　network　nodes　as　the　network　edges,　and　the　elevation　difference　as　the　weight.　Through　quantitative　description　and　analysis　of　the　nodal　characteristics　and　spatial　structure　of　the　loess　gully　in　the　Loess　Plateau,　the　spatial　pattern　and　changes　of　the　network　characteristics　of　different　landform　types　of　the　Loess　Plateau　were　obtained.　We　further　analyzed　the　development　process　and　evolution　mechanism　of　the　loess　valley　landform.　The　results　show　that:　The　cumulative　probability　of　the　node　strength　of　the　gully　weighted　networks　in　the　Loess　Plateau　was　exponentially　distributed.　Correlation　coefficients　were　all　above　0.80,　and　the　complex　networks　were　in　the　transition　period　from　random　network　to　scale-　free　network;　From　the　south　to　the　north　plots,　the　node　strength　values　of　the　characteristic　points　of　the　gully　showed　a　gradually　decreasing　trend,　and　the　distribution　was　asymmetric,　with　higher　erosion　intensity　and　more　node　distribution　on　the　right　side　of　the　gully;　The　average　path　length　and　the　network　structure　entropy　in　Suide　area　reached　the　maximum　of　30.94　and　6.31,　respectively,　and　gradually　decreased　at　the　north　and　south　sides.　The　change　curve　of　network　density　was　the　opposite.　The　connectivity,　stability,　and　compactness　of　the　network　structure　reflected　the　erosion　degree　of　different　gully　geomorphic　types　and　evolution　mechanism　of　the　geomorphic　system;　The　correlation　coefficient　between　network　index　and　traditional　geomorphic　index　was　more　than　0.85.　This　parameter　emphasized　the　attribute　characteristics　and　spatial　topological　relationship　of　different　valley　feature　points　and　the　differences　of　feature　points　in　spatial　relationship.　It　can　scientifically　and　accurately　express　the　complexity　and　development　stage　of　the　geomorphology　and　is　expected　to　be　used　as　an　important　parameter　to　study　the　geomorphological　characteristics　of　the　gully.　Our　method　considered　the　spatial　topological　relationship　of　the　gully　topography　and　the　integrity　of　the　system　and　provided　a　new　idea　for　the　research　of　complex　surface　morphology.　©　2021,　Science　Press.　All　right　reserved.