In　heterogeneous　networks,　Cell　Range　Expansion　(CRE)　is　presented　to　expand　the　coverage　area　of　the　Pico　Base　Station　(PBS).　However,　the　Pico　User　Located　in　the　CRE　(CRE　UE)　can　suffer　server　interference　from　the　Macro　Base　Station　(MBS).　The　existing　interference　cooperation　schemes　which　the　MBS　stops　transmitting　or　decreases　transmission　power　can　improve　the　performance　of　CRE　UEs,　but　may　result　in　the　throughput　loss　of　Macro　Users　(MUEs).　To　address　the　issue,　the　dynamic　power　control　of　the　PBS　in　cooperation　clusters　is　proposed　to　balance　the　performance　of　the　CRE　UE　and　the　MUE.　Unlike　the　existing　studies,　PBSs　can　cooperate　to　serve　the　CRE　UE　thus　implementing　amorphous　coverage　and　every　PBS　in　cooperation　clusters　dynamically　increases　its　transmission　power　to　protect　the　CRE　UE　from　the　interference.　We　maximize　the　weighted　objective　function　to　optimize　the　increased　transmission　power　per　PBS　and　the　ratio　of　resources　which　the　PBS　increases　transmission　power.　Simulation　results　show　that　while　ensuring　the　satisfactory　system　average　throughput,　the　proposed　scheme　greatly　improves　the　throughput　of　the　CRE　UE,　and　reduces　the　performance　loss　of　the　MUE　as　compared　to　the　traditional　approaches.