The plumb line variation(PLV) in Yunnan Province during 1985 - 1997 measured by gravimetric network in the province is compared with that in time-latitude residuals measured by photoelectric astrolabe in Yunan Observatory. The result indicates that the interannual PLV of 0.002″ obtained from the gravimetric technique are in a good accordance with the correspondent component in the time and latitude residuals derived from the astrometric observations. This fact shows once again the evidence with which one may recognize the reality of the interannual variations of the plumb line at Yunnan Province and the ability of the two techniques in measuring PLV in practice.
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