We simulate the anti-proton and proton interaction to evaluate the PANDA detector performance in the measurement of the semileptonic decay form factor of $D^{+}_{s}->e^{+} \eta \nu_{e}$. The kinematics of the neutrino have been reconstructed with a complete simulation model of the detector and reconstruction. With theoretical predictions of the cross section, we obtain a preliminary estimate of the expected count rate for the future data taking.