The present paper describes the basic principles of Petrosonde technique inexploration for structures and mineral deposits, explains the function and perfor-mance of the petro-sonde instrument developed by U.S. Geophysics Internation-al Corporation, and makes a. rather detailed report on the result of petro-sondetest performed in several exploration areas of China last year. Based on ananalysis of the measured results by petro-sonde technique in such locations asthe Kailuan coal mine, the Renqiu oil field in North China and a hydrologichole in the suburbs of Beijing, in comparison with the drilling data available,the author gives a review on the application result of this technique. Whileaffirming its effectiveness, he also points out its limitation in application.