Although the year 2021 is full of transformations and challenges，the epidemic is volatile，facing unprecedented challenges，China adheres to the construction of ecological civilization and takes the green road of development.International environmental law in 2021 is still fruitful.Scholars have conducted in-depth studies on the basic theoretical issues of international environmental law，biodiversity protection，marine environmental governance，response to climate change，international water law and other aspects.At the same time，China actively participates in global ecological environment governance，supports the process of environmental conventions，and contributes China’s wisdom and strength to the world.