After I typed this:

> if (!require("BiocManager", quietly = TRUE))
+     install.packages("BiocManager")

and this:

> BiocManager::install(c("DESeq2"))

It finally showed several warnings:

1: In .inet_warning(msg) :
  unable to access index for repository https://bioconductor.org/packages/3.14/data/annotation/bin/windows/contrib/4.1:
  无法打开URL'https://bioconductor.org/packages/3.14/data/annotation/bin/windows/contrib/4.1/PACKAGES'
2: In .inet_warning(msg) : downloaded length 1490944 != reported length 14683981
3: In .inet_warning(msg) : downloaded length 512000 != reported length 4174173
4: In .inet_warning(msg) : downloaded length 225280 != reported length 726863
5: In .inet_warning(msg) : downloaded length 700416 != reported length 2761645
6: In .inet_warning(msg) : downloaded length 1683456 != reported length 5387247
7: In .inet_warning(msg) : downloaded length 1875968 != reported length 2165505
8: In .inet_warning(msg) : downloaded length 1490944 != reported length 2464862
9: In .inet_warning(msg) : downloaded length 1093632 != reported length 2709823
10: In .inet_warning(msg) : downloaded length 1208320 != reported length 2313169
11: In .inet_warning(msg) : downloaded length 671744 != reported length 2894471
12: In .inet_warning(msg) : downloaded length 45056 != reported length 739834
13: In .inet_warning(msg) : downloaded length 1720320 != reported length 2525587
14: In .inet_warning(msg) : downloaded length 1282048 != reported length 2145015
15: In .inet_warning(msg) : downloaded length 1122304 != reported length 1237594
16: In .inet_warning(msg) : downloaded length 1138688 != reported length 1608744
17: In .inet_warning(msg) : downloaded length 876544 != reported length 2956288
18: In .inet_warning(msg) : 从zip文件中抽取1时出了错
19: In .inet_warning(msg) :
  无法打开压缩文件'Biostrings/DESCRIPTION'，可能是因为'No such file or directory'

What should I do to solve them? I just start to learn this, so please give me accurate instructions. Thanks a lot!(I'd appreciate it if you could reply in Chinese!)

This is a network issue, as the developer of the package I can't give any pointers really. Maybe try downloading on another network?