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In order to guarantee the transmission rate of local area communication link is stable and reliable in low voltage remote power meters-reading region under the demand of limitation for smart meter communication unit power consumption in Q/GDW 1379.4-2013 technical specification, a bit and power allocation algorithm based on max margin for high speed carrier is proposed. This algorithm takes the G3-PLC that combines the advantages of narrow-band carrier and broadband carrier as the application object. Bound water injection algorithm is utilized to restrict the transmission bit number on every sub-carrier and adjustment bit and power allocation scheme adaptive according to the time-varying power-line channel gain. Meanwhile, to response the demand of system BER and target transmission rate, the SNR threshold algorithm is used to define and optimize the bound water injection algorithm. Thus , the expression of the max power margin is obtained. Simulation results show that the algorithm proposed can adapt itself to the low-voltage power line channel is better in performance than that of the low feedback overhead algorithm. The max margin will reach 20 when system target transmission rate comes to be 200kbps and this will reduce the actual power consumption of the modulation and demodulation chip on the communication unit to a great extent.