介绍了用于测量注汽井井下蒸汽压力、温度、流量、干度四参数的ＧＣＹⅡ测量仪及其方法原理。该测量仪采用钢丝起下、金属绝热瓶隔热，在井下用单片机采集存储数据，再在地面用主机回放处理测量结果。室内实验证明该测量仪的压力、温度测量误差小于０５％，流量、干度测量误差小于６％，现场应用也取得了良好效果 The GCYⅡmethod for measuring the four parameters of steam pressure, temperature, flow and dryness of steam injection well is introduced, and the principle of the method is introduced. The measuring instrument uses a steel wire, metal insulated bottle insulation, the use of single-chip microcomputer in the downhole acquisition of stored data, and then on the ground with the host playback measurement results. Laboratory experiments show that the measuring instrument pressure, temperature measurement error is less than 0  5%, flow, dry measurement error of less than 6%, the field application has also achieved good results