The reason the women cover the their head with a veil.

In worshiping God, we need God's appointed regulations and laws. 

Every woman who prays or worships ought to cover her head, 

while every man who prays or worships ought not to cover his head. 

  

1Co 11:1~6 

Follow my example, as I follow the example of Christ…

Every man who prays or prophesies with his head covered dishonors his head. 

And every woman who prays or prophesies with her head uncovered dishonors her head … 

If a woman does not cover her head, she should have her hair cut off; 

and if it is a disgrace for a woman to have her hair cut or shaved off, she should cover her head. 

God teaches us that every man who prays or worship with his head covered dishonors his head, because the head of man is Christ in the Bible. 

But if a woman does not cover her head, it is a dishonor to her head. 

So woman should cover her head with a veil during worship.