The Fourth Beijing-Chicago Workshop on Future Colliders was held in Beijing on September 14-15, 2015. The workshop is jointly sponsored by IHEP and the University of Chicago. Eighteen scientists from the University of Chicago, Fermi National Accelerator Laboratory, Argonne National Laboratory and about fifty scholars from home attended the workshop. 

The workshop lasted two days and was held separately in IHEP and in the University of Chicago Beijing Center. The workshop had more than 30 talks, concentrating mainly on the discussions about the future CEPC-SPPC. 

IHEP has been maintaining good cooperative ties with the University of Chicago and the U.S. national laboratories in Chicago area. The workshop, aiming to bridge the exchanges and the collaboration among the participating institutions, has been in session for four times so far. 

During the workshop, a Memorandum of Understanding on collaboration between the two sides was signed between IHEP and the University of Chicago.