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Using $2.93\,\rm fb^{-1}$ of $e^+e^-$ collision data collected at acenter-of-mass energy of 3.773\,GeV with the BESIII detector, we present ameasurement of the branching fraction of the doubly Cabibbo-suppressed (DCS)decay $D^0\to K^+\pi^-\pi^0$ and a search for the DCS decay $D^0\toK^+\pi^-\pi^0\pi^0$. The branching fraction of $D^0\to K^+\pi^-\pi^0$ isdetermined to be $[3.13^{+0.60}_{-0.56}({\rm stat}) \pm 0.09({\rm syst})]\times 10^{-4}$. No signal is observed for $D^0\to K^+\pi^-\pi^0\pi^0$ and anupper limit of $3.6 \times 10^{-4}$ is set on the branching fraction at the90\% C.L. We combine these results with the world-average branching fractionsof their counterpart Cabibbo-favored decays to determine the ratios of thedoubly Cabibbo-suppressed over the Cabibbo-favored branching fractions,${\mathcal B}(D^0\to K^+\pi^-\pi^0)/{\mathcal B}(D^0\to K^-\pi^+\pi^0)=(0.22\pm0.04)\%$~and ${\mathcal B}(D^0\to K^+\pi^-\pi^0\pi^0)/{\mathcal B}(D^0\toK^-\pi^+\pi^0\pi^0)<0.40\%$ at the 90\% C.L., which correspond to $(0.75\pm0.14)\tan^{4} \theta_C$~and $1.37\times \tan^{4} \theta_C$, respectively, where$\theta_C$ is the Cabibbo angle.

Measurement of the branching fraction of the doubly Cabibbo-suppressed decay $D^0\to K^+\pi^-\pi^0$ and search for $D^0\to K^+\pi^-\pi^0\pi^0$