because technology of foreign countries blockade and basic restriction of terms of our country, the development of numerical control technology paratively slow. During "Sixth Five-Year Plan Period" ," the Seventh Five-Year Plan Period " of the country in second stage and earlier stage in" the Eighth Five-Year Plan Period ", namely introduce technology, digest and assimilate, the stage of establishing the system of production domesticization arisesing tentatively. At this stage , because of reform and opening-up and national attention , and study the improvement of the development environment and international environment, research , development and all making considerable progress in production domesticization of the products of the technology of numerical control of our country. The third
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