 we propose the scheme to enhance photon blockades in two microwave cavities connected by a giant atom. The presence of the atom caused the two cavities to have identical frequencies, resulting in simultaneous photon blockades when either or both cavities were weakly driven. This was due to the anharmonic energy spectrum created by the coupling between the two cavities. When both cavities and the atom were driven strongly, the stronger photon blockade occurred in both cavities as a result of destructive quantum interference. High single photon occupancies could be achieved in both cases. Additionally, we calculated the optimal conditions for achieving conventional and unconventional photon blockades, which agreed well with numerical results. Our scheme offers a promising way to generate simultaneous photon blockades in two indirectly coupled cavities, and may provide a viable route to generating a high quality and brightness single photon source. This article was authored by Cha Maizheng, Wei Zhong, Dong Yang Wang, and others. We are article.tv, links in the description below.