This article proposes a new massive multiple-input multiple-output (MIMO) precoding architecture for terahertz communication. Owing to the larger bandwidth and more antennas in terahertz communication, so beams across the whole frequency band will be divided into multiple ways in space, resulting in significant array gain loss across the whole frequency band. To mitigate the impact of beam splitting, a new way to generate beams is proposed which is called delay-phase precoding (DPP). Based on traditional method we introduced a new layer called delay network between radio frequency (RF) chain and phase shifter network which is supported by many delay elements. This new layer combines delay and phase together which can maintain beams point at one same direction regardless of the change of frequency.