The development and application of simulated water depth are introduced.On the basis of hydrostatics,a set of experimental propositions and equipments of submerged abrasive waterjet (AWJ) is adopted to conduct an investigation on the relationship between eroding depth and simulated water depth in lab. The primary analysis shows that eroding capability of submerged AWJ drops when the depth is larger than the best. The study could provide some theoretical reference for further studies in this field.