只用身份證副本,,,借唔借到錢??

No. Using the copy of the ID is not accepted as a documentary evidence. Moreover, the signature of the borrower is required and it is a usual practice that the borrower should sign his/her name in front of the lender.
But, as this is a private information, you must be more cautious not to make any copy of it unless you have use it for some specific purpose.