  We propose a new method to describe the interacting bose gas at zero
temperature. We use the decomposition of the logarithm of the wave function
into the irreducible $n$-point functions. We argue that in the low density
limit this expansion corresponds to the expansion of the ground-state energy in
powers of the small parameter. For three-dimensional system the correction to
the ground-state energy in density is reproduced. For two-dimensional dilute
bose gas the ground- state energy in the leading order in the parameter
$|\ln\a^2\rho|^{-1}$ where $\a$ is a scattering length is obtained.
