Abstract: Based on the niche theory, Multi functional niche breadth model and evaluation index system is constructed, Three points in time, 2005, 2009, and 2013, play an important role in the regional development in Beijing. Six functional evaluations are performed. The evaluation and evolution of multifunction are analyzed according to the ecological niche breadth value and its rank. The results showed the following: (1) In 2013, the agricultural production and ecological functions of the inner-city is characterized by a low level of functionality; there is a high level of functionality in the outer suburbs. The degree of spatial agglomeration is high, and the distribution is relatively concentrated. The functional level of tourism and leisure and industrial development functions of the outer suburb district is far below that of the inner city and peri-urban areas. The characteristics of the habitat services function is unique and manifests the strongest for peri-urban and suburban plain areas; the inner-city function is second, and the suburban mountainous areas are the weakest. (2) From 2005 to 2013, the overall level of the agricultural production and industrial development functions’ growth increased after first decreasing; the level of the tourism and leisure and the habitat services functions continue to increase. The level of the culture and education and ecological services functions continue to decline. The grade variation amplitude of the tourism and leisure, the habitat services, industrial development, and ecological services functions is minimal; the agricultural production function grade polarization trend is clear. The cultural and education function gradually change to the intermediate grade of concentration. (3) The evolution of the function is usually accompanied with the implementation of the government policy, and it has a certain inertia and hysteresis. The function development of suburban plain areas become increasingly diverse, a large number of agricultural land is occupied, so the agricultural development is restricted. The acceleration of population aging, the reduction of enrollment, the corresponding integration of educational facilities, leading to the weakening of cultural and educational functions gradually. The saturation of housing in the core area, resulting in ease suburban plain area into the core area of the population to absorb the population of Metro. The level of industrial development is vastly different, mainly due to the relocation adjustment of industrial enterprises, as well as the delay caused by the industrial development, and the expansion of industrial function is still the trend of future development. Ecosystem services can only be formed in the outer suburbs, and the need to rely on the role of government regulation.