To make public space of winter cities with high activity, 28 activity influential factors were identified according to scene investigation and visit to the typical public space of winter city. Through the questionnaire survey, the related datum about the influence factors on the degree of people's activity was obtained, and 26 of these factors were retained with factor analysis calculation. These factors were classified into 5 activity factors, which were natural activity factor, location activity factor, space activity factor, facility activity factor and cultural activity factor, respectively. Based on the data, five classification evaluation criterions of 26 influential factors were developed, such as excellent, good, medium, qualified and unqualified. The analysis result shows that it is helpful to improve public space activity of winter cities with enhancing the evaluation level of the 26 factors.