Among many studies about the evaluation of townscapes, we found two problems. (1) Moving factors like pedestrians or cars are not taken into consideration. (2) The consideration for the changes of light condition is not enough. So we made some studies on the influence of change factors (pedestrians, light conditions etc.) in the evaluation of townscapes using SD method. As a result, we found that the evaluations are changing widely through a day, especially with some variables like "bright-dark", "clear-vague", etc.