Recent results from OKA setup concerning form factor studies in $K_{e3}$ decay are presented. About 5.25M events are selected for the analysis. The linear and quadratic slopes for the decay formfactor $f_{+}(t)$ are measured: $lambda_{+}=(26.1 pm 0.35 pm 0.28 )times 10^{-3}$, $lambda_{+}=(1.91 pm 0.19 pm 0.14)times 10^{-3}$. The scalar and tensor contributions are compatible with zero. Several alternative parametrizations are tried: the Pole fit parameter is found to be $M_V = 891 pm 2.0$ MeV ; the parameter of the Dispersive parametrization is measured to be $Lambda_+ =(24.58 pm 0.18) times 10^{-3}$. The presented results are considered as preliminary.
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