Given a Z ≥0 graded vertex operator algebra (VOA) V = ∞ i=0 V i with dim(V 0 ) = 1, then V 1 has a structure of Lie algebra, with the operation given by [a, b] = a(0)b, ∀a, b ∈ V 1 . The affine vertex algebra V r (g) of level r provides such an example, with V 1 = g as a Lie algebra.When dim(V 0 ) = 1, dim(V 1 ) = 0, then V 2 has a structure of commutative (but not necessarily associative) algebra, with the operation aGriess algebra of V . In [HL96] and [HL99], Lam constructed vertex algebras whose Griess algebras are simple Jordan algebras of type A, B, C. In [AM09], Ashihara and Miyamoto constructed for a Jordan algebra J of Type B, a family of VOAs V J ,r parameterized by a complex number r, such that (V J ,r ) 0 = C1, (V J ,r ) 1 = {0}, and (V J ,r ) 2 ∼ = J as Jordan algebra, and Lam's example for type B Jordan algebra is a quotient of V J ,1 . The main result of this paper is a formula about the genus zero correlation function of generating fields in V J ,r .A. Albert classified finite dimensional simple Jordan algebras over an algebraic closed field F with char(F) = 0 [Alb47]. We have a brief review of simple Jordan algebra of type B, and we only consider the case F = C. Let (h, (·, ·)) be a finite dimensional vector space with a non-degenerate symmetric bilinear form (·, ·) and dim(h) = d. Then h ⊗ h has an associative algebra structure:which induces a Jordan algebra structure on h ⊗ h:Let J be the Jordan subalgebra of h ⊗ h consists of symmetric tensors:Then J is essentially the Jordan algebra of symmetric d × d matrices over C, which is called simple Jordan algebra of type B according to Jacobson's notation[JJ49].