For the surface texture evaluation

such as for the parameters of roughness profile

to obtain the evaluation datum

namely mean line for 2 dimensional parameters

is very important besides the interpretation to the parameters definition. In order to appraise the whole performance of the instruments

ISO TC213 proposed Standard ISO 5436-2 of software measurement standard for surface texture. It includes standard data and software for the application of verifying the software performance. Based on Standard ISO 5436-2

the evaluation datum obtained form different theories are researched. They are mean line given by Gaussian filter

Least squares mean lines with order 1 and 2. The standard data are used to calculate the arithmetical mean deviation of the assessed profile. The results show that the roughness parameters almost have no difference based on three mean line