Electromagnetic　properties　of　single-layer　silver　nano-particles　of　compound　metamaterials　are　theoretically　analyzed.　MATLAB　numerical　calculation　and　CST　simulation　are　used　to　verify　the　theory.　The　results　show　numerical　and　simulated　results　of　4.75　nm　nano-silver　arrays　are　basically　the　same,　and　there　are　Lorentz　resonance.　The　simulated　results　have　redshift　compared　to　numerical　results,　having　a　weak　magnetic　resonance.　Further　simulated　compounded　by　the　use　of　4.75　nm　spherical　to　form　large　particles　of　100　nm,　the　results　show　that　there　are　negative　real　permittivity　and　negative　real　effective　permeability　and　negative　refractive　index　in　the　300~380　THz　range.　That　means　100　nm　composite　spherical　particles　have　a　strong　magnetic　resonance　effect　and　consistent　with　the　theoretical　analysis.