Which is more correct?

Do you mean on the certificate?
It depends on what the official name of the qualification is.
In any case, note the correct spelling of "Engineering."

Dear teechr,

yes, i meant in diploma certificate (please see attachment)

I think our IT administrator has made a mistake on the name of course, (see ENGINEERING OF PROTECTION OF ENVIROMENT), so I want to know exactly which is more correct

ENVIRONMENTAL PROTECTION ENGINEERING or ENVIRONMENT PROTECTION ENGINEERING.

I would be grateful if you help me correct the d

I can't find the attachment.

here is the attachment,

No it isn't.

We still can't see your attachment.

I'm really sorry, I tried many times to upload my diploma certificate but I didn't know how to doh

Click on "Reply", "Attach images" then "choose Files."

Note: You should blank out any private/personal information from the image you upload; remember, this is a PUBLIC forum, and anybody can see what you upload. In fact, you can just scan and upload the part of your certificate which shows the title.