For the wireless propagation environment with channel fading and jamming, a received signal theor etical model of unmanned aerial vehicles (UAV) data link system under Nakagami f ading channel is proposed. Then, for two jamming types which is single tone jamm ing and continuous noise jamming, the probability density function (PDF) expressions of instantaneous jamming to signal ratio (JSR), signal to noise ratio (SNR) and signal to interference plus noise ratio (SINR) are derived separately. On this b asis, the average error probability, as well as the outrage probability, is also derived. Numerical simulations verify the analyzed results and showed tha t the continuous noise jamming outperforms the single tone jamming about 3—5 dB, which are helpful for studying on jamming and anti jamming technologies of UAV data link.