[Objective] The method and application of fast accurate calculation of earth-rock work volume were demonstrated to provide effective reference for the engineering design and decision-making arrangements.[Methods] The digital elevation model established by Petrel software was used to realize the 3D precision of earthwork volume.[Results] Through the evaluation of model accuracy, this method not only met the needs of the project, but also was higher than Surfer software.[Conclusion] Combined with the engineering example, the estimation results performed more conservative and reliable. This accurate earthwork calculation can directly demonstrate the expected project results.