The inbound tourism in Guangdong-Hong Kong-Macao Great Bay Area is unevenly developed since the year 2000. Overall，its spatial structure exhibits triple strata，with Hong Kong and Macao lying on the first stratum，Shenzhen and Guangzhou the second，whilst，the rest seven cities in Guangdong Province the third. Moreover，this spatial structure remains relatively stable，even though the inbound in this area had already gone through three stages，namely，the Emerging Stage （2000-2003），the Rapid Development Stage （2004-2008） and the Decelerating Development Stage （2009-2016）. From the analysis of the spatial structure of inbound tourism market in the Great Bay Area，it could be seen that the development of inbound tourism respectively in Hong Kong，Macao and the destinations in Guangdong Province are closely inter-connected；whereas，its distribution is highly concentrated. Meanwhile，due to the disparities embedded within the functionality and positionality of the involved destinations，the inbound tourism market for this Bay Area，on the whole，embraces multiple features and characteristics：First，the inbound tourism markets for Hong Kong are diversified and they are extended to multiple regions across the globe. Second，with respect to Macao，tourists from East Asia and Southeast Asia mainly constitute its market. And，third，despite being less mature than its peers in Hong Kong and Macao，it is most likely for the inbound tourism market for the nine cities in the Pearl-River Region to be immensely extended，also including a large number of tourists mobilizing from the USA and Europe. All in all，there appears a huge opportunity for these three regions to collaborate in future，though currently the inbound tourism development in Hong Kong，Macao and the cities in Pear River Region remains in different stages. Furthermore，as the construction of the Great Bay Area，either as a brand or grand destination，is penetrating，it is predicted that the spatial structure of the regional inbound tourism might be refigured and the flows of in tourists might be floating in an accelerating fashion accordingly. In this case，it seems rather rewarding as if Great Bay Area would be employed either to expand the inbound tourism market or to promote this area as an appealing destination.