In order to figure out the related research achievements of the physical fitness of the elderly and ex- plore its future trend, this paper aims to carry on the co -word analysis, cluster analysis and multi -dimensional analysis on 300 papers from CNKI ( China National Knowledge Internet) by using Bicom and SPSS. The result shows that the research hot issues are mainly about "the difference of the physical fitness of the elderly between the urban and rural areas and the influence of aerobics fitness on the physical fitness of the elderly", "...