As an important accessory, auto glass accounts for 3% of the total vehicle weight. It is mainly used in new vehicle manufacture and repair market. Demand for auto glass is closely related to the production and sales volume as well as reserve of automobiles. China remains the world's largest manufacturer and sales country of automobiles from 2009. Increasing production volume and reserve of automobiles bring huge growth potential in auto glass market in China, which is highly monopolized. Leading enterprises of auto glass, such as Asahi Glass Co., Ltd. and Saint-Gobain, occupy most of the market shares.