The study was to investigate the generalizability of perceived organizational support and job satisfaction as positive correlations of employee performance in China. In a study conducted, 130 matched cases of 130 employees and their 34 immediate supervisors from two large-scale state-owned enterprises were selected as participants. Standardized psychological scales measuring POS, job satisfaction, four facets of OCB were administered. Data analyzed using zero-order correlation and hierarchical regression analysis showed positive correlations of POS and job satisfaction with work performance, and also showed independent and joint positive associations of POS and job satisfaction with OCB and each of its four dimensions.