This work studied the inner CO_2 and sulfur removal in Ca chemical looping coal gasifier and calciner. CaO can be used as the chemical looping material to release heat in gasifier, and also to absorb CO_2 and H_2S in the gasifier. It was found that, almost all CO_2 and H_2S can be fixed to CaCO_3 and CaS in gasifier by continuous gasification experiment. In gaifier: CO+H_2O+CaO→CaCO_3+H_2, CO_2+CaO→CaCO_3, H_2S+CaO→CaS; In calciner: CaCO_3→CaO+CO_2(capture); CaS+2O_2→CaSO_4
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