Science Partner Journal Ultrafast Science is an online-only Open Access journal published in affiliation with Xi’an Institute of Optics and Precision Mechanics (XIOPM) of CAS and distributed by the American Association for the Advancement of Science (AAAS). The mission of Ultrafast Science is to build a platform for ultrafast scientific research; present new theories, concepts, ideas, technologies and progress in this field; publish the latest research representing the forefront of the discipline and that of international concern; and promote academic exchange and development worldwide. The journal publishes content which features high novelty, significance and technical quality in cutting-edge and emerging topics in ultrafast science with broad interest from scientific communities. The scope of Ultrafast Science includes such topics as: attosecond light source, attosecond physics, ultrafast laser and application, ultrafast imaging, ultrafast spectroscopy, ultrafast diagnosis, ultrafast materials and detector, ultrafast terahertz photonics, ultrafast electronics, ultrafast chemical physics and other ultrafast phenomena.