To increase the working distance (more than 30 cm) of receiver of resonant coupling circuit and get correct data from receiver, a power and data transmitting circuit with capacity matching is designed based on frequency splitting theory. Research on series circuit shows that maximum transmitting distance with required power is related to load impedance. And SP-mixed matching (Series-Parallel-mixed) circuit can modify equivalent load impedance to increase working distance while decreasing some transmitting power. To transmit data from receiver to transmitter, suitable modulation load should be selected to tradeoff transmitting power and distance based on backscatter theory and load properties of SP-mixed circuit. Conclusions are verified by matlab simulation. And results of real system testing show that maximum working distance of SP-mixed circuit increases to 38 cm, up 20% compared to series circuit while ensuring data is transmitted correctly.