Given a contact form $\eta$, there is a one-to-one correspondence between the Riemannian structures $(\eta,g)$ and the CR-structures $(\eta,L)$. It is interesting to study the interaction between the two associated structures. We approach the geometry of contact Riemannian manifolds in connection with their associated CR-structures. In this context, for a contact Riemannian manifold $(M;\eta,g)$ we consider the Jacobi-type operator $R_{\dot\gamma}=R(\cdot,\dot\gamma)\dot\gamma$ along a self-parallel curve $\gamma$ with respect to the (generalized) Tanaka connection $\hatbnabla$.This work was financially supported by Chonnam National University in the program, 2001.