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The theodolite is an precise instrument which be extensive used in the measure of astronomy, the earth, engineering. It is used primarily for triangle measure and geography line of precise, and can be used for weather, railroad, highway, bridge, water conservancy, mountain, building and large machine install and measure. As the accuracy is different in various instrument, and all of theodolite campany consider that reason and key are different, different kind of electronic digital theodolite revise concrete item is incompletely consistence. The article consider to analyze these main error margin :the error margin of stalk,the error margin of the degree dish,the error margin of read systems of measure angle and the error margin of the level. At first, this article elucidat in brief measure of electronic digital theodolite and principle, Immediately after,analysis delicately and carefully various error margins of this type electronic digital theodolite,establish mathematics model of the correction error margin of this type electronic digital theodolite, and calculat、examine each single-item error margin and mode, to Insure this type electronic digital theodolite can attain enough accuracy after make use of this model; At the same time, this article Bring up some standpoint about how to increase the accuracy on the research to manufacturing of electronic digital theodolite.
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