NHK is accelerating the development of production system and transmission-receiving system toward the launch of test broadcasting of 8K Super Hi-Vision (SHV) in 2016 according to the road map provided by the Ministry of Internal Affairs and Communications. New specifications for 8K SHV were standardized in July 2014. This paper describes a summary of a new subtitle, superimpose coding and transmission scheme and describes a subtitle transmission and receiving prototype system based on the specification.