The current study aims to verify the impact of children's secure attachment to their mothers on their mastery motivation in the light of the dependence on domestic workers' phenomenon in the Saudi society. To achieve the goals of the study, a random sample of Saudi children was selected from Riyadh city in Saudi Arabia, whose favorable economic circumstances contributed in the dependence of their families on domestic workers. The sample is consisted of two pre-school children groups who were under six years old; the first group is consisted of (74) child whose families depend on domestic workers, while the second group is consisted of (109) child from families who do not depend on domestic workers to care for their children. The outcomes were collected after applying DMQ 17 questionnaire for assessing mastery motivation for children below the age of 6 for George Morgan. The results showed that early attachment's relationship with mothers has a prominent impact on the mastery motivation development. Moreover, the outcomes showed no significant effects of domestic workers who are in charge of housekeeping, and care services on all mastery motivation dimensions.