The objectives of this research are to analyze the differences of transparency of Corporate Social Responsibility disclosures before and after the implementation of the Law of the Republic Indonesia Number 40 Year 2007. Variable used in this researchis Corporate Social Responsibility Disclosure Index. The populations used in this research are all manufacturing companies listed on the Bursa Efek Indonesia since 2004 to 2010 successively. The samples are selected based on purposive sampling method. There are 77 data that meets the criteria as the research samples. The analysis method used to tested hypothesis in this research is Paired Sample T-Test. The result of this research shows that there are differences in Corporate Social Responsibility disclosure transparency before and after the Corporate Social Responsibility disclosure obliged. The results of research indicate that government policies in Corporate Social Responsibility disclosure can increase the transparency of Corporate Social Responsibility disclosure and total asset turnover.