Out-of-Band (OOB) emission and High Peak-to-Average Power Ratio (PAPR) are two main challenges for Orthogonal Frequency Division Multiplexing (OFDM) systems. There are many techniques that have been proposed to solve either one of the problems. Precoding plays a role in the solution of both problems, but generally a specific precoding scheme only solves one of them. In this paper, we combine two precoding schemes which solve two problems separately, and then propose an improved precoding method to solve OOB emission and high PAPR problem simultaneously. So that we can use only one precoding matrix to achieve our two goals. The simulation results show that our method reaches a balance between the two problems and has similar BER performance.