Dear colleagues,

On behalf of the local organizing committee, Chinese Society of Allergy(CSA) and Beijing Society of Allergy, we would like to welcome all of you from home and abroad to attend the APAAACI2019 and CSA2019 joint meeting in Beijing.

September, so-called golden autumn is the best season in Beijing. Beijing is one of the seven ancient capitals in China. It was built over 3000 years ago and developed to a capital city 1000 years ago. It has the largest number of world heritage sites in the world, and many scenic spots, historic sites, comprehensive and theme museums. It is a city combining history with modernity, and where the East meets West.

We hope that the participants from all over the world will have a chance to appreciate Beijing's historic sites, beautiful scenery and delicious food, while enjoying the academic feast presented by this congress.

Lianglu Wang President, Chinese Society of Allergy Co-Chair, LOC APAAACI 2019 Joint CSA 2019	Xueyan Wang Vice President, Chinese Society of Allergy President, Beijing Society of Allergy Co-Chair, LOC APAAACI 2019 Joint CSA 2019