The Basic Law (BL) is the constitutional document of the Hong Kong Special Administrative Region (HKSAR). Put into effect on July 1, 1997, it enshrines within a legal document the important concept of “One Country, Two Systems".
Q: Is Chinese the only official language allowed under the Basic Law?
A: No, in addition to Chinese, English is also an official language used by the executive authorities, the legislature, and the judiciary of the HKSAR. (BL Article 9)