In　this　work,　the　effect　of　doping　with　5%　to　20%　poly　zinc　acrylate　(PZA)　complexes　on　MgB2　phase　formation　was　studied.　The　changes　of　the　lattice　parameter　and　the　amount　of　substituted　carbon　in　the　microstructure　as　well　as　the　critical　temperature　and　the　critical　current　density　(J　(c))　of　bulk　MgB2　have　been　studied　systematically.　Both　differential　thermal　analysis-thermogravimetric　(DTA-TG)　analysis　and　infrared　(IR)　spectrometry　results　show　that　the　PZA　was　decomposed　between　400A　degrees　C　and　600A　degrees　C,　and　the　main　decomposition　products　were　carbonized　polymers　and　ZnO.　The　lattice　parameter　a　in　all　PZA-doped　MgB2　samples　was　decreased　by　different　degrees,　which　indicates　gradual　substitution　of　carbon　on　the　boron　sites　in　the　MgB2　crystal　structure.　Compared　with　the　undoped　sample,　the　J　(c)　values　of　all　the　doped　samples　were　enhanced　by　about　an　order　of　magnitude　under　high　magnetic　fields.　The　J　(c)　value　of　the　MgB2　sample　with　20%　PZA　doping　sintered　at　800A　degrees　C　for　1　h　reached　8　kA/cm(2)　at　5　K　and　8　T.　Transmission　electron　microscopy　(TEM)　images　revealed　a　considerable　amount　of　second-phase　particles　of　similar　to　5　nm　size,　and　a　high　density　of　dislocations　was　observed　in　the　MgB2　grains.