In recent years, LED advertising screens have been widely used in cities around China. However, LED screens have induced serious chromatic light trespass problem to residential area around. 17 cases of LED advertising screens and residential buildings affected in Beijing-Tianjin region are studied to make clear influence degree and control measures of the light trespass. The survey is conducted by subjective questionnaire and objective measurement, as LED screens are tested for color coordinates and corresponding brightness range. A total of 187 valid questionnaires and 288 sets of valid test data are collected. The questionnaire and test data show that 3 factors (relative location, brightness and its variation, colors change in rotation) is the key factors of intrusive effects. The range of wavelength and their corresponding luminance ranges for chromatic lights are summarized. Finally, some design recommendations are provided concerning LED screens setting.