The Cooperative Agreement on LHAASO （Large High Altitude Air Shower Observatory）& Yading High Altitude Cosmic Ray Science Center was signed in Chengdu on September 9, 2015. The leaders from the Sichuan Development and Reform Commission, Ganzi Prefecture, IHEP and the Chengdu Branch of CAS witnessed the signing of the agreement. 

The signing ceremony was chaired by Wang Jiatu, Deputy Party Secretary of the Chengdu Branch of CAS. Representing IHEP, IHEP Director Wang Yifang made remarks at the ceremony. He expressed his hearty thanks to the local governments at different levels for their strong support. He assured the attendees that IHEP would try its best to accomplish the construction of LHAASO by cooperation with the local governments and the Chengdu Branch of CAS, pushing forward the development of basic science research. 

Ganzi Prefectural Governor Yixidawa pointed out at the ceremony that the signing of the cooperative agreement marked a substantial phase of construction for LHAASO, and a new chapter to the economic and social development in Ganzi as well. The project would not only serve as a national level educational base in Ganzi but also a platform open to the outside world. The governor said that the Ganzi people are looking forward to the early completion of the project, he promised to provide all the conveniences to the project within the framework of the agreement and the laws. 

To better manage and push forward LHAASO construction, an IHEP legal person in Ganzi was set up and was named as“ Yading High Altitude Cosmic Ray Science Center”. A plaque-unveiling ceremony was held for the center afterwards. 

LHAASO will be a key frontier project in international cosmic ray research field, which will make significant contributions to the search for the origin of cosmic rays.