Nihe iron deposit，belonging to the porphyrite type iron deposit，is located in the northwest of Luzong basin, a distict in the metallogenic belt of the Middle and Lower Reaches of the Yangtze River area. A lot of materials and data have been accumulated during long time basic geological study，showing that the Nihe iron deposit is closely associated with the top surface morphology of the pyroxenediorite porphyrite.Taking the intrusion (diorite porphyrite)as the study object, we establish the detailed 3D geological model based on the borehole data,using the discrete smooth interpolation method. Through three dimensional morphological analysis method on the surface of the intrusion we reproduce the morphology of diorite porphyrite body and extract the uplift and depression area on the surface of the intrusion after discreting the 3D model. Compared with the existing orebody, the relationship between the metallogenic rock uplift shape and the position of ore body have been verified. After multiple processing tests,we determine the best local window size and prospecting indicators related to the mineralization, proving that it can recognize more than 80% ore by using sliding window of 10×10 unit. Considering the explorion in the 3D space analysis method for 3D metallogenic prediction,which demonstrates the effectiveness of metallogenic 3D morphological analysis method of rock mass, this conclusion can be directly applied to the porphyrite iron ore deposit 3D metallogenic prediction.