Hong Kong Regulations

ELECTORAL AFFAIRS COMMISSION (ELECTORAL PROCEDURE) (DISTRICT COUNCILS) REGULATION - SECT 21

No nomination for more than one constituency

(1) A person cannot be nominated as a candidate in an election for more than
one constituency.

(2) A person who wishes to be nominated as a candidate in the same election
for a constituency other than the constituency for which he or
she has for the time being submitted a nomination form ("first constituency")
must, before he or she submits a nomination form for that other constituency,
withdraw his or her candidature for the first  constituency, in accordance
with section 20, and declare in the nomination  form for that other
constituency that his or her candidature for the first  constituency has been
withdrawn.