In this paper, we propose a new location aided MANET routing protocol based on GSR, aiming at reducing inaccuracy of link state routing caused by topology changing in high motion conditions. We deploy a link weight assignment method according to the relative position and speed of each pair of nodes, together with a routing protocol named LAGSR, with the purpose of ameliorating routing accuracy, avoiding much more additional overhead. Unlike ordinary geographic routing protocol, LAGSR is a proactive link state routing protocol. Our experiments proved that LAGSR has superior performance on accuracy than GSR in MANET composed of high-speed mobile nodes.