Please help us help you and fill where relevant:
Your LimeSurvey version: [6.5.4]
Own server or LimeSurvey hosting:self-host
Survey theme/template:fruity
==================
I want to send the link to the students' group. Invite them to take part in a survey. I want to make sure they are the student in the right rank, I have the student ID number data. So, I think I can add a cover page for this survey; the participants need to input the student's ID to pass the cover page. So I can do it with LS? I think it is best to add this blank form to the register page. The perfect interface would be to input the Email and student ID only. How can I do it？

Thanks

Use the student IDs as tokens. If you do not append a token to the survey URL, they will be presented with a screen to enter their token before starting the survey.

The problem is I do not have their email, so on the register page, the Email is for Survey sending, and the ID is for identity confirmation. I still want to sent survey by emails to them
Is that possible?

How many valid IDs?
You can add all valid IDs i a question of type "huge text" as default answer with a certain structure like
#ID001ID#ID002ID#ID003ID#ID004ID#... (I do not know the structure of your IDs.)

Then after entering the ID check with the function strpos(haystack,needle) if the entered ID is in your ID pool

And as your installation is on your own server you may consider an ajax call.
Create a database with your IDs.
Create a script to query your database which returns TRUE or FALSE

Joffm