The given definite function formula there will obtain certainty result only derived from variations,and relation transmit(sensitive) coefficient between the result and variation is also regarded as the ratio betwwen the standard deviation of result and the standard deviation of variations.But it is no relational that the variations were from surveying or by given.According to this basic principle and letting the variations change randomly,we have triumphantly calculated that uncertainty of measurement for result about distant inherent error;proportion error factor and distant's standard deviation of Hand-held Laser Distant Meter in this paper,and let it be not difficulty to calculate that uncertainty of measurement for result and sensitive factor estimated from complicated mathematical mode contained so much import variations.