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a general steps (a) to eliminate or reduce the lines is constant (2), the measurement data for the mathematical expectation, that arithmetic average :, in which n is the number of measurement data for the first time measurement data. (3), for the remaining error : (4), according to Bessel formula for standard deviation : (5) to check whether there is a large error. Check with the Xiaoweina criteria. If a certain measurements corresponding to the results, think it is bad value, be removed. (6), if a bad value, after excluding re-steps (2) to (5), until no bad value date. (7), with or without value judgment is poor. Judgment is available Malikefu guidelines or A 171-Hemeite criteria. (8), calculated arithmetic average of the standard deviation : the need attention, as previously had calculat