We　report　on　a　two-step　wet　chemical　route　for　producing　Cu@Ni　core-shell　particles　with　multiple　needle-like　branches　on　the　surface.　Using　the　usual　synthesis　process,　urchin-like　Ni　shells　were　formed　on　the　surface　of　spherical　Cu　cores　and　monodisperse　particles　were　obtained.　Under　the　direction　of　a　static　magnetic　field,　one-dimensional,　well-aligned　Cu@Ni　particles　were　assembled　through　cross-linking　the　branched　Ni　shells.　The　monodisperse　Cu@Ni　particles　show　stable　and　uniform　field　electron　emission,　having　a　low　turn-on　field　of　3.3　V/mu　m　and　a　large　current　density　of　1　mA/cm(2)　under　an　applied　field　of　about　5.33　V/mu　m.