In order to further explore the effect of void characteristics on the pavement performance of OGFC asphalt mixture, the methods of MATLAB digital image processing were used to obtain the mesoscopic image of the cross section of the functional asphalt mixtures (OGFC-13, OGFC-16). The mechanical properties test and drainage performance test of OGFC asphalt mixture were carried out at the same time. The results show that the total number of voids and the number of voids above 10 mm2 in OGFC-13 are more than those in OGFC-16, and the connected voids in the latter are more than those in the former, and the drainage performance of OGFC-16 is better than that of OGFC-13, but it is easy to suffer water damage. The low temperature and water stability of OGFC-13 is better than that of OGFC-16, but the performance at high temperature is opposite. Through the gap morphology image shows that the gap in OGFC-13 is blocked by fine aggregate, while the gap clogging degree in OGFC-16 is obviously lower. This makes OGFC-16 have better drainage performance and poor low temperature performance and water stability.