Abstract On the basis of a measurement of the cost efficiency of twenty security firms of our country with SFA method，the authors used the panel data of 2006-2009 to test the traditional SCP hypothesis，relative market power hypothesis and efficiency structure hypothesis. The study found that the security market of our country supports traditional SCP hypothesis：market concentration is significantly positively related to security firms' performance, the relationship between market share，efficiency and security firms' performance is not significant, and efficiency and market share are irrelevant.
2012, Vol. 
