The development of urban lighting and the widespread use of LED have led to increasingly bright outdoor light conditions, common colored light in residential areas and increasingly impacts on residents' indoor recreational activities before curfew. From the perspective of residents' subjective feelings, the subjective evaluation experiment results in the interference threshold of urban colored light on residents' watching TV activities under the condition of normal indoor lighting, which includes the "lightness threshold" characterizing residents' visual perception and the "brightness threshold" characterizing of light source reality. This paper analysed that the seasonal difference, gender difference and hue difference of urban lighting color interfered with residents' indoor activities. And the applicability of threshold conclusion was also discussed.