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M otor vehicles and t r aff ic police depar tm ents, St ate t r ansport aut hor it y t o f ur t her clar if y the Division of labour , im plem ent ation r esponsibilt y, st r engt hen our colabor at ion and m anagement ogether , r einf orcing t he managem ent of dr ivers on which st r ongly synt hetic war f are and inf or mation war f ar e. 3 st rict ly im plem ent ed. Fr om M ay 1 up, a is im plem ent ed plex r oad and bad weat her dr iving exam , cur rent ly DM V is ur ged cont ract or s part y in t r easur es dr iving school incr eased sim ulat ion Highway, and cont inuous ur gent det ours, and snow days, and wet sliding r oad, and bur st sit uat ion disposal, subj ect s I I field t o dr iving exam pr oject, is expectedII Design of Digital Power source Abstract The method of this paper based on the AT89C51 microcontroller core of the numerical controller DC power supply design theory and realization. The digital DC power supply from the analog power, display circuit, control circuit, digitaltoanalog conversion circuit, regulator circuit and analogtodigital converter circuit posed of six parts. This system is based on the principle of singlechip microputer to control the unit AT89C51 to DAC0832 digitaltoanalog converter chip reference voltage to control the output voltage, while the analogtodigital converter ADC0832 chip convert the sampling of voltage to digital signals. Analog power supply to provide the various chips, digital amplifier control and the required operating voltage, display circuit for displaying the size of power supply output voltage, output voltage value may be stepping through the control button (177。 ), and a long button press when under the continuous increase or decrease. And pared to the traditional regulated power supply with easy to operate, high power stability, as well as the size of the output voltage characteristics of the use of digital display. This system has the resistance to interference well, the reliability is high, and finally output voltage value and real demonstration value precision higher merit. Key words: Digital DC Voltagestabilized Power Source AT89C51 DAC0832 TLC1543 evaluat ion of scient if ic developm ent . Natur e secur it y t ype natur e securit y is t o m aint enance people of healt h value f or t arget , t hrough st rengthening secur it y based m anagement , and r is k m anagement , and equipm ent m anagement and t echnology super vision, ensur e pr oduction in t he people, and r eal, and syst em, and system, elem ent s secur it y reliable, and har m ony unif ied, f ul cont rol var ious against f actor s, achieved t hought no slack, and management no em pty document , and equipm ent no hidden, and syst em no blocked, and unit zer o nonst opped. Qualit y and ef f iciencyqualit y benef it is t o adhere t o t he enter prise survival, pr ofit and developm ent business t rut h, adher e t o t he all act ivit y is econom ic activit y, all cost s can be cont roled, m oney should not be wast ed m anagement philosophy, m anagement analysis, t o im prove management qualit y, im prove cost contr ol capacit y and m ar ket petit iveness. Innovation of science and t echnologyscience and t echnology innovat ion is t o play t he r ole of science and t echnology as t he pr im ar y pr oduct ive f orce, act ive use of new t echnologies, new m at er ials, new pr ocesses, new equipm ent , incr ease invest ment in science and t echnology, st rengthening scientif ic and t echnological t r aining, speeding up t ransfor ming scient if ic and t echnological achievement s, f or ming a num ber of pr opr ietar y technology, enhancing cor e petit iveness. Resour cesaving t he resources saving ent erpr ise was t o r educe coal consum pt ion, wat er consum ption, elect ricit y at t he cor e, enhance t he oper ation of lean m anagem ent t o r ealize low consumpt ion, high ef ficiency, r educe pr oduction cost s. Second is t o st rengthen t he business, f inancial, m ater ial, inf orm at ion and t he opt imizat ion of or ganizat ion and manag