Abstract: In order to make up the shortcoming of the multi-looms data transmission and mass data transmission by point to point wireless transmission technology, a way of the wireless transmission by multicast technology was put forward. In this paper the technology ways of multicast transmission were introduced; the mainly communication protocol structure and protocol time planning were analyzed in detail; Mathematical model of transmission efficiency was built, the transmission efficiency of unicast and multicast were analyzed by simulation. Time of unicast and multicast data transmission were tested respectively in the test platform in the workshop. The scheme of multicast technology has been proven more efficient and more stability by the test analysis result.