Yellow,
I'm confuse a little.
in .htaccess must be(from download file):
RewriteRule ^\.htaccess$ - [F]

RewriteCond %{SCRIPT_FILENAME} !-f
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^(.*) index.php?/$1 [E=VAR1:$1,QSA,L]

or(from web instruction):


RewriteRule ^\.htaccess$ - [F]

RewriteCond %{SCRIPT_FILENAME} -f [OR]
RewriteCond %{SCRIPT_FILENAME} -d
RewriteRule .* - [L]

RewriteRule ^(.+) index.php/$1 [E=VAR1:$1,QSA,L]