The work aims to study the effect of settings of iPad brightness and environment illumination on color characteristics of iPad. The absolute chromatic value of color blocks displayed on iPad with the brightness of fourteen different equipment set under three kinds of conventional lighting environments was measured. Color characteristics of iPad, such as color temperature, contrast, channel additivity, constant channel chromaticity and color gamut, with the brightness of various kinds of equipment set under different environment illuminations were analyzed. When the brightness of iPad was lower than 175 cd/m2, the environment illumination had greater impact on such color characteristics as color temperature, contrast, channel additivity, constant channel chromaticity and color gamut. When the brightness of iPad was greater than 175 cd/m2, the environment illumination had smaller impact on the coloring rendering of iPad. Under the same environment, the change in equipment brightness had greater effect on the color gamut and color temperature of iPad and had smaller effect on other color characteristics. When the equipment brightness was larger, the color of shaded area was compressed. Under general environment illumination, when the backlight brightness set is larger than 175 cd/m2, the color rendering of iPad is better and more stable, but part of shaded colors are compressed.