Influenced by the Indosinian Lincang granite,the level the natural radioactivity in the Lincang Basin is relatively high.This work deals with the determination of natural radioactivity of soil in this area by using the γ-ray spectrometer.The specific activities of 226Ra,238U,232Th and 40K obtained were obviously greater than the average values of these nuclides countrywide and worldwide,which were 53.4 (from 38.7 to 62.8),161.2 (from 127.3 to 211.7),120.9 (from 106.5 to 140.6) and 632.2 (from 521.7 to 707.5) Bq/kg.Based on the research data,the level of natural radioactivity of the granite was high,which impacts and provides a good source of soil radioactivity in the study area.To assess the radiological hazard of the natural radioactivity in soil,the γ-absorbed dose rate and annual effective dose rate were calculated.The results show that,although the γ-absorbed dose rate in the study area is a little high,the annual effective dose rate is lower than the recommended value.So the Lincang Basin is safe with respect to radiological level and its living environment is not affected.