To fit the need of the country for regional planning,this paper summarized the work of Jing-Jin-ji metropolitan regional overall planning,it first proposed the idea that "Harmonization" is the soul of regional planning,then illustrated that the regional overall planning should be harmonized with special planning,higher level and lower level regional planning in three different phases,which covers the duration range from prophase research,its pilot study result and pilot planning report.The contents of Harmonization include strategic contents,planning contents,project items and policies.