Abstract: The Hujiameng area in Yixian county is located in the south of Anhui province,the tin-polymetallic of the Hujiameng area is also located in the northern margin of the north eastern section of "Jiannan ancient continent ",the high-precision magnetic measurement and 1∶10 000 soil geochemical survey are conducted in the Hujiameng area,the inversion calculation results of the measured data show that:①the anomaly area in the Hujiameng area is divided into three anomaly areas,they are northern anomaly area,middle anomaly area and southern anomaly area (M-1#，M-2#,M-3#)，the northern anomaly area is characterized by the distribution of relatively low magnetic anomaly,the anomaly intensity is lower than 50 nT,the middle anomaly area is characterized by high anomaly intensity (more than 100 nT) and continuous distribution,the southern anomaly area is characterized by moderate anomaly intensity scattered distribution,according to the distribution pattern,intensity and geological characteristics of anomaly areas,it is inferred that there are two hidden faults and two concealed rock bodies are existed in the area.②The distribution characteristics distribution of the trace element is closely related to geological background in the area,the Sn contents in the northern anomaly area is higher than that of the southern anomaly area,the distribution area of the high values of Sn contents is almost the same as the granite type of rock mass (M-1#anomaly area),seven tin anomaly areas are circled in the area,therefore,the tin deposit prospecting potential in the area is huge.Based on the above results,it is further show that the higher the degree of rock crushing,the better of the ore contents,the contents of Mo,Sn and W are increased gradually from the inner of the rock mass to the margin of the rock mass,the Hujiameng area is located in the northeast intersection of the "diamond" structure of Jiangnan transition zone,the metallogenic conditions is favorable,it is more likely to find the porphyry deposit that is similar to the porphyry type tungsten molybdenum deposit.

Key words: High-precision magnetic measurement, Soil geochemical survey, Anomaly distribution, Metallogenic conditions, Porphyry type tungsten molybdenum deposit