Noise figure is the important parameter of wideband RF photonic link, which can affect signal to noise ratio of RF transmission and processing system. However,noise figure of RF photonic link is generally deteriorated by related optical noise.In this paper,a novel RF photonic link with noise cancellation i s proposed.In this kind of RF photonic link,noise figure can be improved by de tecting direct current light signal and modulated light signal with the same opt ical power at balanced photodetector.According to the variation feature of sign al and noise,a theoretical model about noise figure of RF photonic link with no ise cancellation is built,and the expressions and characteristics about noise f igure are investigated.The relationship between noise figure and laser power,r elative intensity noise,optical loss of modulator and coupling ratio of optical coupler is demonstrated in theory.In the experiment of RF photonic link with n oise cancellation,noise figure with the frequency of 6~18GHz is studied in comp arison.It is shown that noise figure of RF photonic link with noise cancellatio n can be improved 2~4dB under the same condition.The theoretical analysis and e xperimental results can prove the validity of noise subtracting method in RF pho tonic link.RF photonic link with noise cancellation can be applied in practice.