Combining with domestic city sewage treatment technology status,the thesis analyzes A/ O sewage treatment technology and biofilm treatment technology problems,and puts forward corresponding improving proposals,with a view to improve sewage treatment level and to meet living environment demands as well.%结合国内城市污水处理工艺的现状，对 A/ O 污水处理工艺与生物膜处理工艺中存在的问题进行了分析，并提出了几点针对性的改进建议，以提高污水处理水平，满足人们对生活环境的需求。
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