The construction of high-speed rail has entered a comprehensive high-speed growth cycle, pulling the expansion of the heat shrinkable materials market. The heat shrinkable materials of high speed iron are mainly used in the high iron Berg plate, which can protect the insulation when the rail transfer signal is transmitted, and the circuit protection of the electrified locomotive is also useful. According to the national "12th Five-Year" plan, the construction of high speed railway will reach 16 thousand and 30 thousand kilometers respectively in 2015 and 2020. According to our forecast of heat shrinkable materials, the market demand for the hot shrinkable materials will reach 930 million and 1 billion 750 million in 2015 and 2020 respectively. The gross interest rate of high iron heat shrinkable materials is above 50%, and the overall gross interest rate of heat shrinkable materials in 2010 is 28%, and the high iron heat shrinkable material will become one of the highest profit margins in the heat shrinkable material industry.