2021 IEEE International conference on Nano/micro Engineered and Molecular Systems (IEEE-NEMS 2021) was held jointly by Xiamen University, Peking University and University of Electronic Science and Technology of China(UESTC) in Xiamen, China during April 25-29, 2021. More than 500 scientists world-wide participated in the conference to share the latest research results. In this review, the current research in nanobiology and nanomedicine, nano/micro sensors/drivers/systems, nanomaterials, nano/micro/molecular manufacturing were introduced. And finally, we summarized and forecasted the development trends of nano/micro technology in the future.