The dense phase pneumatic conveying system of carbon black and the experimental process are introduced in the paper. According to the test data, the factors that influence the carbon black conveying performance are analysed. This paper points out that the higher of air flow rate will increase the conveying capacity of carbon black, but will approach to a critical value. The open pressure of the blow pot has a optimal extent, in which the carbon black conveying time will be the shortest. This paper also points out that the longer the conveying distance, the higher the carbon black fragmentation rate.