【正文】 ential characteristic faces the processing course, obviously, he can39。t meet demands of highspeed development of the technology of modern numerical control more and more already. For this reason, studying and making a kind of new CNC system standard ISO14649 (STEPNC ) in the world, its purpose is offering a kind of neutral mechanism not depending on the concrete system , can describe the unified data model in whole lifespan of the products , thus realize the whole manufacture process, and even the standardization of each industrial field product information. The appear ance of STEPNC may be a revolution of the technical field of the numerical control, on development and even the whole manufacturing industry of the technology of numerical control , will exert a farreaching influence. First of all, STEPNC puts forward a kind of brandnew manufacture idea , in the traditional manufacture idea, NC processes the procedures to all concentrate on single puter. Under the new standard, NC procedure can be dispersed on Inter, this is exactly a direction of open , worked development of technology of numerical control. Secondly, STEPNC numerical control system also can reduce , process (about 75% ) drawing , process procedure work out (about 35% ) time and process (about 50% ) time greatly. At present, AmericanEuropean countries pay much attention to the research of STEPNC, Europe initiates IMS plan ( ) of STEPNC. 20 CAD/CAM/CAPP/CNC users , manufacturers and academic anizations from Europe and Japan participated in this plan. STEP Tools Company of . is a developer of the data interchange software of manufacturing industry in the global range, he has already developed and accused of the super model (Super Model ) of information exchange of machine tooling by counting, its goal is to describe all processing courses with the unified norm. Such new data interchange form has already been verified in allocating the SIEMENS , FIDIA and European OSACANC numerical control at present. 2 pairs of basic estimations of technology and industry development of numerical control of our country The technology of numerical control of our country started in 1958, the development course in the past 50 years can roughly be divided into 3 stages: The first stage is from 1958 to 1979, . closed developing stage. In this stages, technology of foreign countries blockade and basic restriction of terms of our country, the development of the technology of numerical control is paratively slow. During Sixth FiveYear Plan Period , the Seventh FiveYear Plan Period of the country in second stage and earlier stage in the Eighth FiveYear Plan Period , introduce technology , digest and assimilate, the stage of establishing the system of production domesticization arisesing tentatively. At this stage , because of reform and openingup 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 stage is that on the later stage in the Eighth FiveYear Plan Period of the country and during the Ninth FiveYear Plan Period , implement the research of industrialization , enter market petition stage. At this stage, made substantive progress in industrialization of the domestic numerical control equipment of our country. In the Ninth FiveYear Plan latter stage, domestic numerical control domestic market share of lathe reach 50% , mix domestic numerical control system (popular ) to up to 10%. Review the development course in the past 50 years of technology of numerical control of our country, especially pass the brainstorm of 4 FiveYear Plans, all in all has made following achievements. a. Have establish the foundation of the technical development of numerical control, has basically mastered the technology of modern numerical control. Our country know from numerical control system , servo urge , numerical control host puter , special plane and their basic of fittings basically already now, among them most technology have already possessed the foundation that is mercialized and developed , some technology has already, industrialization mercialized. formed the industrial base of numerical control tentatively. In tackling key problems the foundation that the achievement and some technology mercialize , set up the systematic factories of numerical control with production capacity of batch such as numerical control of Central China , spaceflight numerical control etc.. Electrical machinery plant of Lanzhou, a batch of servo systems and first machine tool plant , first machine tool plant of Jinan of servo electrical machinery factory and Beijing ,etc. several numerical control host puter factories such as the numerical control in Central China. These factories have basically formed the numerical control industrial base of our country. set up research of a numerical control, development , managerial talent39。s basic team . Though has made considerable progress in research and development and industrialization of the technology of numerical control, but we will realize soberly, the research and development of the technology of advanced numerical control of our country, there is greater disparity between current situation and current demand of our country of engineering level especially in industrialization. Though very fast from longitudinal development to watch our country, horizontal until (contrast with foreign countries ) , the engineering level has disparity, there is disparity too in development speed in some aspects, . the disparity of engineering level between some highgrade , precision and advanced numerical control equipment has the tendency to expand . Watch from w