In the observation of short side horizontal angle,there are obvious external factors.This paper analyz-es the corresponding errors of instrument,telescope focusing and structural error of the measuring instrument and observation target.Aiming at the structural error of the measuring instrument and observation target in the short-side horizontal angle observation,this paper puts forward a measuring method of 180° overall rotation of the measuring instrument and observation target and base in the next half of the measurements.Based on this measuring method,a rotating observation cloud platform and a double-side transparent observation board are designed,and various side length measurement experiments are conducted.It is proved that this measure-ment method can effectively reduce the influence of structure error of instrument and observation target on the observation accuracy of short-side horizontal angle.
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