The　single-beam　magneto-optical　trap　(MOT)　based　on　the　diffractive　optical　element　offers　a　new　route　to　develop　compact　cold　atom　sources.　However,　the　optical　efficiency　in　the　previous　single-beam　MOT　systems　is　usually　low　and　unbalanced,　which　will　affect　the　quality　of　the　trapped　atoms.　To　solve　this　issue,　we　developed　a　centimeter-scale　dielectric　metasurface　optical　chip　with　dynamic　phase　distributions,　which　was　used　to　split　a　single　incident　laser　beam　into　five　separate　ones　with　well-defined　polarization　states　and　uniform　energy　distributions.　The　measured　diffraction　efficiency　of　the　metasurface　is　up　to　47%.　A　single-beam　MOT　integrated　with　the　metasurface　optical　chip　was　then　used　to　trap　the　87Rb　atoms　with　numbers　similar　to　1.4　x　108　and　temperatures　similar　to　7.0　mu　K.　The　proposed　concept　in　this　work　may　provide　a　promising　solution　for　developing　ultracompact　cold　atom　sources.