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Ultra-cold ions confined in ion traps are promising for quantum information processing.Under the control of electromagnetic field,the ions are stably confined in a nearly isolated space,where the internal(spin)states of individual ions can be manipulated by lasers and the spin states of two trapped ions are coupled by means of the vibration modes of the ions.Experiments have evidenced that all necessary quantum gates for quantum information processing can be accomplished in the trapped ions.We report our recent experimental works in a home-built planar electrode chip trap.The chip trap can confine hundreds of ions in a cloud state,and move 27 ion crystals under full control,which are the prerequisite for trapped-ion quantum information processing.By changing the trapping parameters,we have observed configuration phase transitions,depending on the conformation of the ion crystals,the number of the ions involved and the confining potential of the trap.With the ions cooled down to micro-Kelvin,the configuration phase transition will get into quantum regime.Meanwhile,Tavis-Cummings model can be realized by a line of trapped ions,where quantum phase transition from normal state to super-radiant state is available under current experimental condition.