Research about leader-member exchange (LMX) mainly exists in workplace. But it may enhance the life of the worker in family. Based on work-family enrichment theory and contingency theory, we build a model of LMX, access to resources, negative affect and family undermining. We argue that LMX influences employee’s access to resources, which in turn, leads to their family undermining. In addition, informed by the contingency theory, we further propose that employee negative affect moderates the relationship between LMX and employee’s access to resources, such that LMX are more positively related to employee’s access to resources when employee’s negative affect is high rather than low. To test the model, we collected the data from a bank in cheng du of si chuan province. With the assistance of the human resource manager of the firm, a list of randomly selected 300 subordinates and their spouses was prepared. Three waves of data collection occurring with two-week interval were performed in order to reduce common method bias. Ultimately, our sample consisted of 193 matched husbands-wives dyads. Of the 193 employees, 44% were male. The average age was 30.23 years (sd=6.50), and the average tenure in the organization was 7.62 years (sd=6.99). In terms of their education level , 1.04% held middle school degree or below, 17.10% held high school degree, 64.77% held junior college degree, and 17.1% held a bachelor degree or above. Results of hierarchical regression analysis revealed that: (1) leader-member exchange was negatively related to employees’ family undermining;(2) leader-member exchange was positively related to employees’ access to resources; (3) employees’ access to resources was negatively related to employees’ family undermining; (4) employees’ access to resources mediated the relationship between leader-member exchange and employees’ family undermining; (5) negative affect moderated the relationship between leader-member exchange was positively related to employees’ access to resources, such that the positive relationship was stronger when negative affect was high rather than low.