Machinery and electronics. Large scale industry product especially. The reason is that China is a relatively late comer into the international market. As the result, many small electronics are brand name dominated. Basically, common day to day buyers generally have very little idea on the specifics of the product, but will purchase a more famous brand name. This means China is at a disadvantage in those products. However, industrial buyers tend to have more time and effort to research the product and will prefer cost-effectiveness over brand name. Since Chinese excel at making cost-effective products, it becomes its number 1 export.