How to analyze 4He content in minerals accurately is the key to the （U—Th）/He dating. Because 4He is gas,it is relatively hard to measure its content.There are no lab except ours in China can analyze the 4He content now. This paper introduces the 4He content analyzing method in foreign (U—Th）/He lab and the method our lab uses based on the exiting noble gas Mass Spectrometer. We use the 0.1mL air in the pipette equipped with the original instrument to calibrate the 4He content in the sample. In order to prove our method is accurate, we use this method to measure the 4He content of Durango apatite which is used as analytical standard in (U—Th）/He lab. The mean 4He content of three Durango apatite aliquots is 1.2472×10-8mol/g which is in agreement with that of Sole (2005).We also measured the 238U、232Thand 147Sm in the Durango apatite and get its（U—Th—Sm）/He age of 30.1Ma which is within error of 31.02±1.01 Ma（1σ）obtained by McDowell（2005）.The above results show our method of measuring 4He content is feasible.