how to customize my views-view-table.tpl.php?
The best way is to use field_info_instance($entity_type, $field_name, $bundle_name)to get information about specific instance of a field. The label of the field is contained in the array returned from that function.

The general code : 

&lt;?php
 $info = field_info_instance($entity_type, $field_name, $bundle_name);
 print $info['label'];
    ?&gt; :

in my situation : 

&lt;?php
 $info = field_info_instance('node','property_photo','property');
 print $info['label'];
    ?&gt; :

OR 

by Using this Code :

&lt;?php print $header['$field_name']; ?&gt; :


in my situation :

    &lt;?php print $header['property_photo']; ?&gt; :


that's it .