A controversy of increasing number of visitors leading to deterioration of exhibition visitors’ experience has become one major problem encountered by National Palace Museum. Since Taiwan began allowing mainland Chinese travelers to visit, the visiting crowd to Taiwan has greatly expanded. At National Palace Museum in particular, the number of mainland Chinese visitors has doubled year by year. Nonetheless the relevant measures in the Museum’s attempt, such as visiting traffic control, adjustment on the admission, extension of opening hours, have not been proven effective. More efforts may be needed to better solve the problems. This study applies research approaches including observation, document analysis, and questionnaire survey to summarize the peak hour and off-peak hour and also the most popular exhibit. Further the study incorporates Doxey’s Irritation Index ("Irridex") model developed in 1975 to verify the result of survey regarding the feelings of residents and non-mainland-Chinese tourists towards the phenomenon of mainland Chinese visiting population expansion. Consequently up to around eighty percent of the interviewees consider that the visiting population to National Palace Museum has reached saturation; there is little capacity to accept new visitors and conflicts for using facilities or resources have emerged. The interviewees’ response can be classified as at "irritation stage". On the other hand, around thirteen percent of the interviewees have expressed hostile attitudes to the inconvenience and unpleasant experience caused by the tourists and even started to reject tourism. These residents have come to "antagonism stage" by here. Finally the essay attempts to propose feasible solutions to enhance the quality of visitors’ experience and to provide a friendly and comfortable visiting environment. In the short term, suggested measures include to evaluate the Museum’s capacity of visiting population, to improve visiting traffic control so as to disperse the crowd during rush hour, and to rearrange the space and location of popular exhibits. Whilst in the long term, expanding the museum and its space may be the top priority.