Brownian motion in R 2 + with covariance matrix Σ and drift µ in the interior and reflection matrix R from the axes is considered. The asymptotic expansion of the stationary distribution density along all paths in R 2 + is found and its main term is identified depending on parameters (Σ, µ, R). For this purpose the analytic approach of Fayolle, Iasnogorodski and Malyshev in [12] and [32], restricted essentially up to now to discrete random walks in Z 2 + with jumps to the nearest-neighbors in the interior is developed in this article for diffusion processes on R 2 + with reflections on the axes.