thanks philipe for reply.
I customize joomla core and hikashop for not required email field.and works fine.
now joomla user register and login without email.
I for hikashop register customize user.php(administrator/classes path) and insted of email , address_telephone.
now when register user in chekout page , register works fine.and in customer menu(hikashop backebd) and user menu joomla reg.
and login worked fine.
only problem in checkout page :
mode register in hikashop conf : simplifield with password(mode 3)
when user fill form register in chekout page , show this error when ajax refreshing for automat login.
please help me.so thanks