We study the modularity of generating series special cycles on unitary Shimura varieties over CM-fields degree $2d$ associated with a Hermitian form in $n+1$ variables whose signature is $(n,1)$ at $e$ real places and $(n+1,0)$ remaining $d-e$ for $1\leq e <d$. For $e=1$, Liu proved Xia showed absolute convergence series. On other hand, Bruinier constructed regularized theta lifts orthogonal gr...