The development of the Greater Bay Area will inevitably bring closer civil and commercial affairs between Hong Kong and the Mainland. For example, Hong Kong residents go to the Mainland to get married, family reunions, inheritance undertakings, Hong Kong businessmen or Hong Kong-registered companies go to the Mainland to invest and do business, and involve Hong Kong parties or companies to the Mainland. Proceed with litigation and so on. Due to the legal system of the Mainland and Hong Kong不is different. Therefore, when conducting the above-mentioned cross-border affairs, if there are Hong Kong documents or evidence to be used in the Mainland, they must be notarized, stamped and forwarded by a Chinese-appointed notary appointed by the Ministry of Justice of the People's Republic of China.