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We consider the singular $SU(3)$ Toda system with multiple singular sources\begin{align*} \left\{\begin{array}{ll}-\Deltaw_1=2e^{2w_1}-e^{w_2}+2\pi\sum_{\ell=1}^m\beta_{1,\ell}\delta_{P_{\ell}}\quad\text{in}\mathbb{R}^2\\ \rule{0cm}{.5cm} -\Deltaw_2=2e^{2w_2}-e^{w_1}+2\pi\sum_{\ell=1}^m\beta_{2,\ell}\delta_{P_{\ell}}\quad\text{in}\mathbb{R}^2 \\ w_i(x)=-2\log|x|+O(1)\quad\text{as }|x|\to\infty,\, i=1,2,\end{array}\right.\end{align*} with $m\geq 3$ and $\beta_{i,\ell}\in [0,1)$. Weprove the existence and non-existence results under suitable assumptions on$\beta_{i,\ell}$. This generalizes Luo-Tian's \cite{Luo-Tian} result for asingular Liouville equation in $\mathbb{R}^2$. We also study existence resultsfor a higher order singular Liouville equation in $\mathbb{R}^n$.

On $SU(3)$ Toda system with multiple singular sources