2021 International Conference on Dynamical Science and Energy Engineering (ICDSEE 2021) has received much attention from scholars since its inception and it was successfully held on October 15, 2021. Due to the COVID-19 outbreak, we had to change the offline conference originally scheduled in Chengdu to an online conference. ICDSEE 2021 online conference includes 4 keynote speakers and 4 oral speakers to share academic reports. Thanks to the support of experts and scholars! The conference will be held once a year and we sincerely invite you to attend the conference again.