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In this paper, a three-layer chiral structure is proposed to achieve the conversion of its performance between broadband circular polarization asymmetric transmission and broadband circular dichroism by rotating the upper layer of the structure. For circular polarization asymmetric transmission, its asymmetric transmission parameters can reach a maximum of 0.89 and over 0.5 from 134 to 225 THz. For circular dichroism, the co-polarized transmission coefficient of right-handed circularly polarized wave is above 0.8 and the co-polarized transmission coefficient of left-handed circularly polarized wave is lower than 0.25 from 137 to 214 THz. The above results have not been reported in previous papers. This structure provides potential applications for circular polarization converters and circular polarizers.