Shear measurement bias with METACALIBRATION and FORKLENS on CSST simulations. Left panel illustrates shear measurement bias m, while right panel represents bias c for both METACALIBRATION and FORKLENS methods on CSST simulation, as a function of the input shear range ([−0.02,0.02] uniformly for a shear of 0.02 and [−0.1,0.1] for a shear of 0.1). Shear biases for the first component are presented with solid error bars, and the second component is depicted with dashed errors. The findings for a shear of 0.02 are obtained from a dataset of 40 million stamps in total (prior to selection) utilizing SNC, and 10 m stamps for 0.1. The gray regions correspond to the requirements set for stage IV weak-lensing experiments, which are 2 × 10⁻³ and 2 × 10⁻⁴ for m and c, respectively.