Comparison of [Fe/H] Distribution between LAMOST and HRS Data. Left panel: distribution of [Fe/H] for both our results and results from the literature based on HRS. The metallicities from these two datasets follow the function [Fe/H]_HRS = 0·729[Fe/H]_LAMOST − 0.01. The dashed line represents a 1:1 linear relationship. Right panel: residual metallicities between the two datasets, with an average difference of −0.0023±0.114 dex. The red circles represent clusters with fewer than three members in the LAMOST data, while the green crosses represent HRS OCs with fewer than three members.