But expertise seems unlikely.

So let's look further: the line of code you show is neither properly formatted for this site (use <code>...</code> tags around all code and data), nor terribly informative about what your full script may look like. (Knowing that might be helpful.)

However, guessing that you're doing something like:
C:\>perl -e "system("title Myperlscript.exe");"
Unfortunately, that produces this message:
syntax error at -e line 1, at EOF

So, you might wish to consider fixing your quotes to keep the windows shell happy:
>perl -e "system(\"title Myperlscript.exe\");" which would cause something to flash in the title bar... very briefly.

However, that's not an answer to your (presumed) question (and it's wrong, anyway!), so moving away from guessing, the next bit of code would do what you ask (not quite so briefly):
perl -e "system(\"title foo\");sleep 5;"
which would change the title bar caption to "foo" ... for 5 seconds, which is a little short of "permanently" (and one hopes that is merely a careless phrase, since changing Mr. Gates' handiwork - permanently - is beyond the scope of this forum).

Another approach would be to use this:
perl -e "`title \"my script\"`;print 'enter: ';$x=<>;" which would print enter: on your screen... and (ta da!) change the title bar caption from "Command Prompt" to "my script."

Woot!

Regrettably, as soon as you enter something the caption changes back to "Command Prompt."

However, if you're really interested in learning something from all this, see exec or (at your command prompt) try perldoc -q backticks and perldoc -f exec for relevant discussions.

And, oh yes, please read On asking for help, How do I post a question effectively?, I know what I mean. Why don't you? and Markup in the Monastery to learn what's expected of a SOPW.

Update: fixed typo in link to exec docs; thanks, AnomalousMonk!

title "foobar"
perl yourscript.pl
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No,I want to do it via perlscript.Whenever my exe is run,that command window should have a title

Have a look at Term::Title - Portable API to set the terminal titlebar or Win32::Console - Win32 Console and Character Mode Functions.

Wow. The snarkiness is flying today! And yet no one has the answer! Kuh-ching!

First, an explanation of why your approach doesn't work. When you run system from Perl, you are running a new shell, which is to say a new copy of CMD.exe, which has its own environment. You type title <something> and it works, but as soon as the new shell exits, you're back in the parent shell, which never had its title changed. You have to do it from inside, via the Win32 API.

use Win32::Console; 
my $CONSOLE=Win32::Console->new;
$CONSOLE->Title('This is a new title - Huzzah!');
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That will change the title for the duration of your script. When the script ends, the title will revert to what it was before you ran the script. You can change the title as much as you want.

Cheers!

using system 'title', 'the title;' will work form within your program same as using Win32::Console, for the duration of the program

Start a cmd.exe then run this

perl -e " exec qq[cmd.exe /k \x22title \x22quoted title\x22\x22] "
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Then type "exit" again.

First "exit" exits the cmd.exe with the title "quoted title" started from perl with exec, the second "exit" exists the original cmd.exe.