A kind of mixture of amber and plastic resembling Baltic amber or "Mila" was recently detected by the authors in the course of testing amber samples. The samples of amber-plastic mixture are yellow or yellow-white in color, vary from transparent to opaque and occur as polished or inferior smooth round beads or hand strings with resinous luster. The samples were studied by using such means as gemological methods, infrared spectrum and Roman spectrum. The results show that these samples belong to the community of amber and plastic, with the yellow part being Baltic amber and the white part being artificial alkyl resins. The characteristics for identifying amber-plastic mixture are as follows: there are obvious boundaries between the yellow part and the white part in some samples, but without obvious boundaries in some other samples. The yellow part is characterized by convoluted lines, dense tiny bubbles group under high-power microscope, refractive index of 1.54, yellow green fluorescence under ultraviolet light, diagnostic infrared absorption spectra such as 2 927, 1 737, 1 451, 1 380, 1 257, 1 159 and 983 cm^-1, and Roman spectra such as 1655 and 1 453 cm^-1; the white part is characterized by dull appearance, blue fluorescence under ultraviolet light, the refractive index of 1.60, blue fluorescence under ultraviolet, diagnostic infrared absorption spectra such as 3 061, 1 728, 1 600, 1 580, 1 493, 1 453, 1 282, 1 123, 1 067, 745 and 701 cm^-1, and Roman spectra such as 735, 1 607, 1 460, 1 048 and 1 011 cm^-1.