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大理石平板平面度的檢測誤差的方法有四種：三點法、對角線法、最小乘二法以及最小區域法這四種。
There are four ways to measure the flatness of the marble flat plate: three points method, diagonal method, least square method and the minimum zone method four.
三點法是用實際被測大理石平板表面上相距最遠的三點所組成的平面作為評定基準面，用來平行這個基準面，并具有最小距離的兩包含平面間的距離作為平面度誤差值。
Three point method is with actual measured marble slab surface on the farthest away from the plane as the evaluation reference surface, used to parallel the datum and has a minimum distance of two contains inter plane distance as the flatness error value.

對角線檢測法是以通過實際被大理石平板測表面上的一條對角線，用來平行另一條對角線所作的評定基準面，用來平行于這個基準面且具有最小距離的兩包含平面間的距離作為平面度誤差值。
Diagonal line detection method is through actual marble slab test on the surface of a diagonal line, used to parallel the other diagonal as the evaluation reference surface to parallel to the datum and has a minimum distance of two contains inter plane distance as the flatness error value.
最小乘二檢測法是以實際被測大理石平板表面的最小二乘平面作為評定基準面，用來平行于最小二乘平面，并具有最小距離的兩包含平面間的距離作為平面度誤差值。最小乘二平面是使實際被測大理石平板表面上各點與該平面的距離的平方和為最小的平面。此方法計算較為復雜，一般需要計算機處理。
Minimum by second detection method is to actual measured marble plate surface of the least-squares plane as the evaluation reference surface for parallel to the plane of the least squares, and with the minimum distance of two contains inter plane distance as the flatness error value. The least square of the two plane is the sum of the square of the distance between the points on the surface of the marble slab and the plane of the plane. The calculation of this method is more complex, generally requires computer processing.
最小區域檢測法是以包含實際被測表面的最小包含區域的寬度作為平面度誤差值，是符合平面度誤差定義的評定方法。
The minimum zone detection method is a method to evaluate the definition of flatness error, which is based on the minimum width of the region containing the actual measured surface as the flatness error.