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: Have the laws previously in force in Hong Kong been maintained?
A: The Basic Law provides that laws previously in force in Hong Kong, that is, the common law, rules of equity, ordinances, subordinate legislation and customary law, shall be maintained and adopted as laws of the HKSAR, except for any that contravene the Basic Law and subject to any amendment by the HKSAR legislature. (BL Article 8; 18(1); 160)