the book studies the theoretical analysis of some characteristics in Ad Hoc Networks. It consists of two parts. In the first part, we describe a number of characteristics in Ad Hoc Network with a dynamic topology like the neighbour nodes, the area of the Ad Hoc Network, number of nodes, node density, and area of transmission.the second part studies the effects of topology changes, number of nodes changes, average number of neighbour nodes and transmission range on some location based routing algorithms such as Geographic Distance Routing (GEDIR) and Location-Aided Routing in Ad Hoc Networks.