这句话有没有错As soon as I will go to Tangshan in October to see grandfather

as soon as一般不引导将来时句子。它的中文意思是“一。。。。就。。。。”
这句话不知道你要说什么。
如果是说：
我10月份一到唐山就去看我爷爷。

As soon as I arrive Tangshan in October, I will go to visit my grandfather.

as soon as i go to tangshan, 时间状语从句, 从句中的一般将来时用一般现在时代替.
my grandfather. 英文的习惯， 加上my.