  A systematic description of the Wess-Zumino-Witten model is presented. The
symplectic method plays the major role in this paper and also gives the
relationship between the WZW model and the Chern-Simons model. The quantum
theory is obtained to give the projective representation of the Loop group. The
Gauss constraints for the connection whose curvature is only focused on several
fixed points are solved. The Kohno connection and the Knizhnik-Zamolodchikov
equation are derived. The holonomy representation and $\check R$-matrix
representation of braid group are discussed.
