Under massive MIMO downlink system

without sacrificing Qo S at users

and optimizing energy efficiency

derives signal dynamic transmitting power

the problem is proved to has hidden convex optimization and propose optimization algorithm

dynamically assigns energy to users

at the same time

reducing energy losses. Under the same conditions and hypothesis

simulation results are consistent with theoretical results

and show that performance of optimization algorithm is better than the ZF

ZF is better than the maximal ratio transmission（ MRT）.