An optical coherence tomography (OCT) system with two low coherence sources emitting at 980 nm and 1300 nm is set up. Using this system,we acquire the OCT images of fresh pork at two wavelengths and different source powers respectively. We compare the images obtained at one wavelength with different source power and at two wavelengths with same source power. The corresponding curves of OCT signals versus detection depth are also discussed. The scattering coefficient change of the tissue with the light emitting at two different wavelengths is analyzed by fitting the curve. Results show that the increase of the source power can finitely improve the probe depth and the increase of the source wavelength can improve the probe depth remarkably. The influence of wavelength on parameters of OCT system and the reason for differences between images are also discussed.