It is our great pleasure to welcome you to attend the 4th International Conference on High Performance Compilation, Computing and Communications (HP3C2020), held during June 27-29, 2020. It is cosponsored by the Research Institute of Big Data Analytics, Xi'an Jiaotong-Liverpool University, and Guangdong University of Technology (GDUT), China. With the world fighting together against coronavirus this year, HP3C2020 has been converted into an online conference for the safety of our participants.