How to hide particular field for specific role? I have Article page content type with field title,description,ad_article_top,video etc.
Also have one other role writer.writer can create article page content.

My issue is how to hide the ad_article_top field for writer role at the time he create content but if super admin create article page content the ad_article_top field not hidden

Give me some solution for solving this issue.
You can use Field Permissions module. 


  The Field Permissions module allows site administrators to set field-level permissions to edit, view and create fields on any entity.
  
  Features
  
  
  Enable field permissions on any entity, not just nodes.
  
  
  Role-based field permissions allowing different viewing patterned based on what access the user has.
  Author-level permissions allow viewing and editing of fields based on who the entity owner is.
  Permissions for each field are not enabled by default. Instead, administrators can enable these permissions explicitly for the fields where this feature is needed.