The LawBod's legal history collection policy is concentrated on works on the Anglo-American or common law legal tradition. However we are not without some works which might support your interest. SOLO searches will reveal if other parts of the Bodleian such as the Chinese Studies Library can further assist.
In the Bodleian Law Library, books with a shelf mark starting China can be found on Level 1, one floor beneath the entrance level. There are seats for readers on that floor too.
Note This is a topic where SOLO might reveal useful titles in the KH Chen China Centre Library.
Hong Kong was a British Crown Colony from 1841/2 until 1997. Its legal system was influenced by the English/common law tradition.
In the print collection in the Bodleian Law Library you will see the section of secondary sources has two sequences with slightly different shelfmarks: first Cw Hong K for works predating the transfer; and then shelf marks simply Hong Kong for those published subsequently.