The traditional hydrological cableway use "wired" or "wireless" loop to transport the signal of current meter, but these two loops has the inherent disadvantages such as complicated structure, unstable electricity parameter, so the transmission is not stable and the troubleshooting is difficult, which has seriously affected the work of discharge measurement. This paper presented single chip microcomputer as control core and wireless data radio as channel to transport the signal of current meter, which has obtained the good effect in practice.