The key component of red pigment in roselle is anthocyanins,which is of unstable properties.In order to effectively use the pigment,the coloration and thermal stabilities of the pigment in metal salt solutions were investigated.Results showed that KCl solution have little effect on the coloration and thermal stabilities of roselle red pigment.CaCl₂,Zn SO₄and MgCl₂ solutions can not only strengthen the color,but enhance the thermal stabilities of roselle red pigment.CuCl₂,FeCl₂ and FeCl₃ solutions make the color change and have destructive effect on the stabilities of the pigment.While Na₂CO₃ solution may affect the color stabilities of the pigment by changing pH value of the solution.