Probing the Cosmic Acceleration One of the most intriguing discoveries in modern cosmology is that the expansion of the universe is under an accelerated phase at the present time. Starting from General Relativity and an isotropic and homogeneous universe with components of standard model particles and dark matter, we can not explain this phenomenon. Two kinds of alternations have been proposed to resolve this problem. The first one is that we are missing some mysterious negative-pressure energy component of the universe called dark energy, while the second one is a modification of general relativity theory on cosmological scales. I willl talk about related work on the prospect of probing the properties of dark energy through weak-lensing surveys and also show some results of constraining a self-accelerating braneworld model based on a modified gravity theory called DGP by utilizing current cosmology data.