[Objective] The study aimed to analyze ecological land demand of Shijiazhuang City on the basis of carbon-oxygen balance method. [Method] Firstly, the release and absorption of CO2 and O2 in Shijiazhuang City during 2004-2007 were studied by using carbon-oxygen balance method, and the ecological land area needed for carbon-oxygen balance was calculated, then the ecological land area needed for carbon-oxygen balance in 2015 was predicted. Finally, some measures to reduce the deficit of CO2 and O2 in Shijiazhuang were proposed . [Result] From 2004 to 2007, the unbalance between CO2 and O2 aggravated with the rapid development of Shijiazhuang City's economy, and the ecological land needed increased year by year. If the amount of CO2 released and O2 consumed grows constantly, the area of standard ecological land needed will be about doubled in 2015 compared with 2007 (1.575 6 million hm2), namely increasing to 3.566 million hm2. In addition, appropriately improving the area of mixed forest and other vegetation with higher net production, developing some green energy resources like nuclear energy and wind energy and controlling its population could be adopted to reduce the deficit of CO2 and O2 in Shijiazhuang City. [Conclusion] The research could provide theoretical references for the overall plan of land utilization in Shijiazhuang City.
