  Let $k$ be a field of characteristic $0$. For a superspace $V=V_\bar{0}\oplus
V_\bar{1}$ over $k$, we call the vector $(\dim_k V_\bar{0} ,\dim_k V_\bar{1})$
the (${\mathbb Z}_2$-)graded dimension of $V$. Let $J(D_1|D_2)$ be the free
Jordan superalgebra generated by $D_1$ even generators and $D_2$ odd
generators. In this paper, we study the graded dimensions of the $n$-components
of $J(D_1|D_2)$ and find the connection between them and the homology of
Tits-Allison-Gao Lie superalgebra of $J(D_1|D_2)$ following the method given by
I.Kashuba and O.Mathieu in [KM], where they deal with the free Jordan algebra.
And, four interesting conjectures of above contents are proposed in our paper.
