This lecture introduced the discovery process of radium and its revolutionary changes in chemistry, medicine and other fields. Finally, he pointed out: if radium falls into the hands of evil people, it will become a very dangerous thing, showing concern that scientific achievements may be used by bad people, thus reflecting the Curie couple's high sense of social responsibility and scientific foresight. The language of this speech is very simple and fluent, which shows the noble character of seeking truth from facts of two outstanding scientists.