First go to this official website to download Tomcat:
https://tomcat.apache.org/
Enter the home page, find Tomcat 9 under Download in the navigation on the left, click on it, and you will enter the following page:
Pull the scroll bar, my computer is 64-bit, click this 64-bit Windows zip to download.
After the download is complete, this file is: 
Unzip it to where you want to put it, mine is D:\tomcat-9.0.7, and then set the environment variables of tomcat.
The environment variables are configured as follows:
CATALINA_BASE：D:\tomcat-9.0.7\apache-tomcat-9.0.7
Path: D:\tomcat-9.0.7\apache-tomcat-9.0.7\bin (add it after)
CATALINA_HOME：D:\tomcat-9.0.7\apache-tomcat-9.0.7，
Then go to D:\tomcat-9.0.7\apache-tomcat-9.0.7\bin, click starup.bat,
This screen appears even if the configuration is successful.
How to verify that the configuration is successful?
Do not turn off the above screen, enter http://localhost:8080/ in the browser address bar, and the following screen appears to prove that the configuration is successful.
Common problems: 1: Click startup.bat and it will flash, right-click to edit, enter the edit page, add pause to the last line, save,
Then click startup.bat, if there is: 
Solution: Edit it manually in startup.bat and add it below setlocal:
set CATALINA_HOME=D:\tomcat-9.0.7\apache-tomcat-9.0.7
Save the startup, if the startup is still unsuccessful, I add JRE_HOME to the environment variable (note: it is in the user variable) (see the picture configuration)
Path followed by D:\tomcat-9.0.7\apache-tomcat-9.0.7\bin;D:\tomcat-9.0.7\apache-tomcat-9.0.7\lib
As a result, the tomcat was successfully started. I don't know the specific reason. It may be that the win10 system is incompatible, or the tomcat 9.0 is not stable.
Friends who know, please leave a message below the comment.