I hope to make occupation area uneditable after registration (like username area),but i cann't find the right way,could you tell me how to do it..

So, would you like to completely remove this field, or allow it at the registration level, and disallow at the profile editing level?

If you just don't need this field, you could make it a hidden type... If you'd like to make it read-only at the profile editing, modify templates/user_dataform.html and paste the following tag:

{$editable}

in the code which holds the "occupation" value, resp.:

Glad to receive your reply.After i addd this tag,i find it cann't be edited in html form,but when i submit form,this content is cleared in database,do i need to change bb_func_editprf.php or other php file..?

Ok then... In addition to the above code, try to paste the code below into bb_plugins_user.php and let me know the results. Tried it on my end and it all worked.

It works all right now^^,thanks a lot!!and i have changed occupation field to select type,if i'm going to check data user submit to make sure its value is ok,which code should i modify?

Not quite sure what do you mean, but it all could be done at the add-on's level. You may verify the posted data in bb_plugins.php on the condition like

and then you could supply a default value for the $_POST['occupation'] there, if someone is trying to post a fake/wrong value and so on.

I.e. in this bb_plugins.php you could catch the incoming parameters, verify, parse and re-assign them, before the core script executes.

Thanks for your help,i think i understand a little more now,i will pay more time on this module,it's very flexible and useful.