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This invention discloses a method and system for embryo quality detection, relating to the field of embryo detection technology, including the following steps: S1: fertilized embryos are continuously cultured in an in vitro culture system containing specific metabolic marker detection components, and continuous dynamic imaging of the embryos is performed to obtain a complete dynamic developmental image sequence; S2: the dynamic developmental image sequence is segmented, and temporal developmental features are captured, identifying key time points such as pronucleus appearance and disappearance, cleavage, and blastocyst formation, and generating a segmentation mask corresponding to each frame of the dynamic developmental image sequence; this invention achieves full-process time-difference imaging to capture the temporal features of embryonic development, without trauma or interference, avoiding subjective bias in static observation; by segmenting the dynamic developmental image sequence and capturing temporal developmental features, the segmentation accuracy is high and the anti-interference ability is strong.