The fourth Chinese Conference on Pattern Recognition and Computer Vision (PRCV2021) will be held in Beijing, the capital city of China from October 29 to November 01, 2021. PRCV2021 is jointly sponsored by China Image Graphics Society (CSIG), China Artificial Intelligence Society (CAAI), China Computer Society (CCF) and China Automation Society (CAA); jointly sponsored by University Of Science and Technology Beijing (USTB), Beijing Jiaotong University (BJTU) and Beijing University of Posts and Telecommunications(BUPT), and co sponsored by Sun Yat-sen University (SYSU). The Chinese Conference on pattern recognition and computer vision is a combination of China pattern recognition Conference (CCPR) and China computer vision Conference (CCCV), aiming at the top academic event in the field of pattern recognition and computer vision in China. This session mainly brings together the vast number of researchers and industrial colleagues engaged in the research of pattern recognition and computer vision theory and application at home and abroad to share the latest theoretical and technical achievements in the field of pattern recognition and computer vision at home, so as to provide you with a wonderful academic feast.We are now open to soliciting high-quality, original and excellent academic papers in English. Papers accepted by the conference will be presented at the meeting, and the conference proceedings will be published by Springer press, and be retrieved by EI and ISTP. Excellent papers will be recommended to a special issue of high quality journals at home and abroad.