A　new　approach　is　developed　to　solve　the　Green＇s　function　that　satisfies　the　Hehmholtz　equation　with　complex　refractive　index.　Especially,　the　Green＇s　function　for　the　Helmholtz　equation　can　be　expressed　in　terms　of　a　one-dimensional　integral,　which　can　convert　a　Helmholtz　equation　into　a　Schrodinger　equation　with　complex　potential.　And　the　Schrodinger　equation　can　be　solved　by　Feynman　path　integral.　The　result　is　in　excellent　agreement　with　the　previous　work.