A design and evaluation software for precision farm land levelling engineering was developed with the application of modified plane method. The software has different functions such as farm land elevation data input and statistic analysis, description of microtopography conditions as well as estimation of earthwork. The application effects of three different interpolated methods on software were evaluated based on field data. The results showed that three interpolated methods could be used to produce grid elevation data in farm land and give out the general description of surface condition. However, the Kriging interpolated method gave out the best estimations for both grid elevation data and the earthwork volume. It is suggested that the Kriging interpolated method is applied in designing for farm land precision land levelling engineering. 