  We present multi-wavelength analysis for four bipolar bubbles
(G045.386-0.726, G049.998-0.125, G050.489+0.993, and G051.610-0.357) to probe
the structure and dynamics of their surrounding gas. The 12CO J=1-0, 13CO J=1-0
and C18O J=1-0 observations are made with the Purple Mountain Observation (PMO)
13.7 m radio telescope. For the four bipolar bubbles, the bright 8.0 um
emission shows the bipolar structure. Each bipolar bubble is associated with an
HII region. From CO observations we find that G045.386-0.726 is composed of two
bubbles with different distances, not a bipolar bubble. Each of G049.998-0.125
and G051.610-0.357 is associated with a filament. The filaments in CO emission
divide G049.998-0.125 and G051.610-0.357 into two lobes. We suggest that the
exciting stars of both G049.998-0.125 and G051.610-0.357 form in a sheet-like
structure clouds. Furthermore, G050.489+0.993 is associated with a clump, which
shows a triangle-like shape with a steep integrated intensity gradient towards
the two lobes of G050.489+0.993. We suggest that the two lobes of
G050.489+0.993 have simultaneously expanded into the clump.
