The article describes the importance of the transducer matching between the piezoelectric ceramic transducer and the transmitting module in Dopple logs. The circuit model of the piezoelectric transducer was analyzed and the electric matching method of piezoelectric transducer was also studied in this paper. The matching circuit diagram of the transmitter and the transducer in Doppler logs was given. The calculation expressions of the tuning elements were also given. By using this method, the transducer can works on its best status. The efficiency of the power amplifier increases too.