Use : db.Set<tale>.AddRange(list);
Ref :
TESTEntities db = new TESTEntities();
List<Person> persons = new List<Person> {
new Person{Name="p1",Place="palce"},
new Person{Name="p2",Place="palce"},
new Person{Name="p3",Place="palce"},
new Person{Name="p4",Place="palce"},
new Person{Name="p5",Place="palce"}
};
db.Set<Person>().AddRange(persons);
db.SaveChanges();