Abstract: In order to improve the productive efficiency of Boer goat, the audio-visual monitoring was carried out in the early pregnancy of Boer goat through B-type ultrasonic diagnostic techniques. And the diagnosis of early pregnancy and the number of pregnancy was studied. The results showed that the Boer goat in early pregnancy （during the first 40 d of gestation） should be diagnosed mainly by rectal palpation and secondarily by abdominal examination. After 40 d of gestation, the fetus was clearly visible as shown by abdominal examination, and abdominal examination was the main diagnostic method. The accuracy rate of pregnancy diagnosis, twin diagnosis, and single-fetus diagnosis was 100 %, 100 % and 81.8 %, respectively.