With the implementation of 2008 Labor Contract Law and a series of related labor regulations，Chinese labor relations have experienced drastic transformation among different groups. Drawing on national survey data of more than 80000 workers conducted by All-China Federation of Trade Union（ACFTU）in 2007 and 2012 respectively，this article uses independent sample proportion difference test to investigate the differences of lab labor or rights security among worker groups from different ages，educational levels，household registrations and employment statuses. The result reveals that the transformation of labor legal system makes diversified effect on worker groups. Since the Labor Contract Law comes into effect，the protection of most labor rights of worker groups in older age，low educational level，migrant workers and ordinary workers are still in significant disadvantage.