Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry can decode prediction information of a chroma coding block (CB) from a coded video bitstream. The prediction information indicates an intra block copy (IBC) mode for the chroma CB and the chroma CB includes one or more chroma units. The processing circuitry can determine a chroma block vector (BV) for one of the one or more chroma units based on at least one luma unit collocated with the one of the one or more chroma units. The at least one luma unit is coded in the IBC mode. The processing circuitry can reconstruct at least one sample in the one of the one or more chroma units based on the chroma BV. The at least one luma unit and the chroma CB can be associated with separate luma-chroma coding trees.