Urban renewal has been deemed as the primary approach to improve the urban comprehensive carrying capacity of old urban areas. However，urban renewal projects have met some problems in implementation，such as the serious damage of renewal projects to natural environment and historical culture，supply of infrastructure and public service facilities，and some social problems arising from the demolition，etc. In view of these problems，this paper is of the opinion that when urban renewal projects do not have enough carrying capacity，it may，firstly，improve the carrying capacity of the urban carrying system，namely，improve the comprehensive carrying capacity of urban natural ecological environment，infrastructure，public service facilities，economy and society；secondly，reduce the pressure of urban renewal projects on the urban carrying system，such as downsizing the construction scale of projects，so as to relieve the pressure on the economic carrying capacity；thirdly，reduce the project development intensity to alleviate the pressure on the natural ecosystem，etc.