HKEx (0388) is waiving transactions fees for bonds from April 3 for a period of three years.
The move comes after Premier Li Keqiang mentioned last week that a link between the SAR and the mainland bond market is to be launched this year.
The exchange also extends the time limit for the report of over-the-counter bond trade, where those taking part can make their filings before the next trading day ends.
HKEx also offers a new function on its "HKEx news" website where the latest information and announcements by listed firms are available.
"Stock connect shareholding search" allows the public to check on shareholdings of mainland investors in Hong Kong stocks included in the stock connect, or holdings of the SAR and international investors of A-shares.