The beamforming method of current Orthogonal Frequency Division Multiplexing(OFDM) passive radar cannot effectively distinguish the target signals distributed at the same angle and different distances. A new frequency diverse processing method based on subcarrier extraction of passive radar receiving signal is proposed. The beampattern can be turned into range-angle dependent by extracting and processing different subcarriers independently for each receiving channel, thus the targets distributed at the same angle and different distances can be processed differently. And the effect of parameters in frequency diverse processing is also investigated. The increased degree of freedom in range dimension with frequency diverse processing can help focus the beam energy on the desired point in space, which improves the performance of radar in target detection, location, and clutter suppression. Simulation analysis shows that a dot-shaped beampattern can be obtained with frequency diverse processing for OFDM passive radar receiving signals, and the experimental results also verify the effectiveness and the practicability of the proposed method.