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Results of a study of the $K^+ \rightarrow \pi^{0} e^{+} \nu \gamma $ decayat OKA setup are presented. More than 32000 events of this decay are observed.The differential spectra over the photon energy and the photon-electron openingangle in kaon rest frame are presented. The branching ratios, normalized tothat of $K_{e3}$ decay are calculated for different cuts in $E^*_\gamma$ and$cos\Theta^{*}_{e\gamma}$. In particular, the branching ratio for$E^{*}_{\gamma}>30$ MeV and $\Theta^{*}_{e \gamma}>20^{\circ}$ is measured R =$\frac{Br(K^+ \rightarrow \pi^{0} e^{+} \nu_{e} \gamma) } {Br(K^+ \rightarrow\pi^{0} e^{+} \nu_{e})} $ ==(0.587$\pm$0.010($stat.$)$\pm$0.015($syst.$))$\times10^{-2}$, which is in agood agreement with ChPT $O(p^{4})$ calculations.

Study of $K^+ \rightarrow \pi^{0} e^{+} \nu \gamma $ decay with OKA setup