Down-hole video captures the borehole images by its mini camera to get real-time information of oil well, it is becoming a hot topic in well logging field. The DHV-05 downhole video is designed, which employed wavelet based imagecompression, high speed digital modulation transmission, CPLD based demodulation, special mechanism to achieve downhole video image compression, high speed wire data transmission, down-hole illumination and high temperature . The stability has been proved through the data transmission test on 3000m wire and 125 high temperature test.