The influence of heat treatment on the structure and martensitic transformation in the 5-layered NiTi sample deposited by wire arc additive manufacturing on Ti substrate was studied. The Ti₂Ni phase was found on the boundary of the Ni-rich NiTi grains after annealing that was not typical for NiTi alloys produced by conventional techniques. This was due to the as-built sample contained Ti-rich NiTi phase in the interdendritic space. During annealing, this phase decayed to the NiTi and Ti₂Ni phases and led to the formation of the Ti₂Ni precipitates on grain boundaries. Annealing led to homogeneous composition of the NiTi phase within the layer but kept it to be different in various layers. This was caused by the Ti₂Ni and Ni₄Ti₃ (Ni₃Ti₂) precipitates formed during annealing, but the diffusion of the Ti and Ni elements between layers hardly occurred. Annealing decreased the difference in Ni concentration in the NiTi phase of the 3^rd to 5^th layers that decreased the temperature range of the martensitic transformation. It was shown that the properties of the NiTi sample deposited to Ti substrate after post-production annealing are close to the properteis of the NiTi sample deposited on the NiTi substrate.