Based on numerical simulation of Gross Pitaevskii(G-P) equation, the dynamical properties of Bose-Einstein condensed gas quantum vortex in a rotating two-dimensional optical lattice are investigated. Influences of optical lattice constant d and optical lattice depth ν0 on quantum vortex are analyzed. Results show that the formation process of quantum vortex becomes faster with increasing of ν0. The physical essence of this dynamic behavior is analyzed by calculating the evolution of system free energy with time. When ν0 is more than 50, there is pinning effect. That is to say, the quantum vortex is fixed on the extreme point of potential energy by optical lattice. When d is greater than 2.7dc (dc is the critical constant), the vortex-antivortex pairs are found.