According to the concept of optimum space-matching between ground rain rate, I, and radar reflectivity factor, Z, for a certain vertical reflectivity profile, this paper presents a method to determine the optimally matched vertical profile of reflectivity for estimating stratiform cloud precipitation in ground clutter areas. The unblocked part of the vertical profile of reflectivity in ground clutter area is first used to find a best partial correlated vertical profile of mean reflectivity from the unblocked areas, and the both are combined to estimate the surface precipitation in the ground clutter area. The varification of estimation error against the raingauge-observed rain rate in the ground clutter area in the stratiform cloud precipitation event on June 18, 2004 in Anhui Province suggest that the method is applicable in operational rain estimation.