  We investigate the interference of two-dimensional Bose-Einstein condensates
in micro-gravity, which influenced by the interaction strength, initial
momentum, gravitational potential and phase difference. We demonstrate that the
gravitational potential from the Earth can change the density distribution and
phase distribution of the condensate's wave function. As time evolves, a
portion of the gravitational potential energy of the microscopic particles can
be converted into kinetic energy, which changes the motion of the microscopic
particles, and leads to the varying of the density and phase distribution of
the wave function. Nevertheless, the influences of the Earth's gravity on the
wave function can be eliminated by the micro-gravity environment, which
confirmed by many micro-gravity cold atom experiments. Our results present the
influences of gravity and other parameters on interference of Bose-Einstein
condensates, which help us to reveal the intrinsic natures of the related
theoretical predictions and experimental phenomena. Furthermore, our work
builds a bridge between the related physical phenomena and our physical
intuition about the Bose-Einstein condensates in micro-gravity environment.
