In this paper, we systemally study the long time behavior of the curve shortening flow in a closed or non-compact complete locally Riemannian symmetric manifold. Assume that we have a global flow. Then we can exhibit a a limit for the global behavior of the flow. In particular, we show the following results. 1). Let $\mathbf{ M}$ be a compact locally symmetric space. If the curve shortening flow exists for infinite time, and $$ \lim_{ t\to\infty}L(\gamma_{ t})>0, $$ then for every $n>0$, $$ \lim_{ t\to \infty}\sup(|\frac{ D^{ n}T}{ \partial s^{ n}}|)=0. $$ In particular, the limiting curve exists and is a closed geodesic in $\mathbf{ M}$. 2). For $\gamma_{ 0}$ is a ramp, we have a global flow and the flow converges to a geodesic in $C^{ \infty}$ norm.
Categories: math.DG