Beijing’s economic structure has changed into the post-industrial structure. The employee and the GDP in the service sector have reached more than 80%. The scale of the middle class is expanding. This paper is to estimate the scale of the middle class in Beijing and analysis their live condition. The data used is the Sixth Census data and 1% sampling survey data by National Statistics in Beijing in 2010 and 2015. It is found that the scale of middle class is about 56% in Beijing. The commercial and service employees become the new source of the middle class. The middle class has higher consumption in housing，cars，and has better social security than manual class. But many middle class number don’t identify with middle class because of high life presses. They worry about housing，the children’s and etc.. The middle class society need higher quality public service and better social governance than ever.