Based on the discussion of the matching problems between the prime mover and pulse tube, a self-made standing-wave ther-moacoustic prime mover is used to drive a coaxial single-stage pulse tube refrigerator A lowest refrigeration temperature of 138 K was obtained from the preliminary tests in 1999 Then, some improvements have been made to the heat exchangers and the con-nection between prime mover and pulse tube The minimum cooling temperatures of ll9.7 and ll7.6 K have been obtained from therecent experiments with helium andhelium-argon mixture filling of 2.0 MPa as the working fluids, respectively Itis a great progress for the standing-wave machine and provides the possibility of liquefying natural gas of 0.2 MP.