As the rapid development of stimulating the manufacturing sector, China's cnc machine growing demand for all types of machine production in recent years significantly increased year by year, machine tool industry The situation is gratifying, the machine tool production in 2003 than in 2002 increased by 33 percent, reaching 306,800 units to become the world's largest producer of the first machine. Machine tool production in substantial growth year on year, while the self-sufficiency rate of China's machine tools are on the decline, machine tool imports increased year by year, every year the total value of imports of machine tools in more than 3 billion U.S. dollars, close to the production for the machine tool output value, the higher the grade Machine basically rely on imports, the value of, machine tools self-sufficiency rate at 50 percent. Whenever the machine to visit the exhibition, to see the rapid development of machine tool industry, was very pleased, but think of these small, can not help feeling a Changranruoshi. This situation resulted in many causes, this paper, an analysis unknown, but casting trade association point of view, to yield growth to the neglect of quality castings, is leading to domestic cnc machine unsatisfactory appearance of existence, and maintain accuracy of poor performance of the important reasons. To further understand the situation, we recently visited some of the major cnc machine casting enterprises, to the scene to conduct an investigation. Although we see only the superficial symptoms, but have a very heavy heart. Following on the casting machine problems that exist in production and related improvements, we made some of the views and opinions. In recent years the rapid development of China's manufacturing industry, the original basis for some machine tool companies to better the focus of the work to expand the scale and increasing the yield on the casting of the annual demand for substantial growth in the quantity and quality to take into account the situation , For the number and quality of care. Some of the original process to provide the basis for control of the test items gradually being abandoned, although some companies also make some, but mostly perfunctory, is not the result of careful analysis, not more talk about a process control. Casting production if not seriously implement the process control, is no guarantee that the quality of castings, generally speaking, China's cnc machine casting the intrinsic Quality, 20 more than the mid-1950s has increased, but decreased.