This paper presents the influences of the basic parameters on the responding performance of the automatic blind control system which is able to shade direct sunlight when shading is required and to allow for a view when shading is not required. From the results of investigation in office buildings with the advanced window system, the automatic blind control system is generally accepted, but the performance of responding to sudden changes of weather conditions is required. Based on the results, the influences of the basic parameters on the responding performance of the system are analyzed; that include the interval time of control, the method of determining the threshold value, the interruption control, the method of detecting direct sunlight, the method of judging cloudy weather. In the results of the analysis, the influences of the parameters are quantitatively assessed.
