  The gravimeter based on atom interferometry has potentially wide applications
on building the gravity networks, geophysics as well as gravity assisted
navigation. Here, we demonstrate experimentally a portable atom gravimeter
operating in the noisy urban environment. Despite the influence of noisy
external vibrations, our portable atom gravimeter reaches a sensitivity as good
as 65 uGal/\sqrt{Hz} and a resolution of 1.1 uGal after 4000 s integration
time, being comparable to state-of-the-art atom gravimeters. Our achievement
paves the way for bring the portable atom gravimeter to field applications,
such as gravity survey on a moving platform.
