Some recent results of spectral characteristic study of integrated HgCdTe (mercury cadmium telluride) infrared two-color detector arrays were presented firstly. Many further investigations of spectral and structural characteristics were fo- cused on SW (short wavelength) response of the preliminary two-color detection arrays Which exhibited a narrow spectrum. The reason and solution of SW spectrum with small FWHM (full width of half maximum) were then found, and the proper spectrum of two-color detector with an improved structure was obtained. The results are as good as expected.