  Exponential vector space [shortly \emph{evs}] is an algebraic order extension
of vector space in the sense that every evs contains a vector space and
conversely every vector space can be embedded into such a structure. This evs
structure consists of a semigroup structure, a scalar multiplication and a
partial order. In this paper we have developed the concepts of basis and
dimension of an evs by introducing the ideas of orderly independent set and
generating set with the help of partial order and algebraic operations. We have
found that like vector space, an evs does not contain basis always. We have
established a necessary and sufficient condition for an evs to have a basis. It
was shown that equality of dimension is an evs property but the converse is not
true. We have studied the dimension of subevs and found that every evs contains
a subevs with all possible lower dimensions. Lastly we have computed basis and
dimension of some evs which help us to explore the theory of basis by creating
counter examples in different aspects.
