Based on the GBEE-CRAS2018，354 CSR reports released by the Mainland companies listed in the Stock Exchange of Hong Kong Ltd.（SEHK） are collected and assessed in this research. It is found that the overall reporting quality is higher than the overall CSR reporting quality in China，and the reports have the following stage characteristics：senior leaders of the company pay more and more attention to social responsibility；reporters pay attention to the disclosure of identification process of important topics，and emphasize the stakeholder engagement in this process；reporters pay attention to and actively respond to the requirements of ESG guide of SEHK. In the environmental field，more information related to environmental pollution and resource consumption is disclosed with high proportion of issues such as emissions and resource. In social field，issues such as employees and community investment，are highlighted，and the level of quantitative information disclosure needs to be improved. More reporters pay attention to performance comparability to further improve their performance management level and keep disclosing the supply chain information as the previous years.