This paper is conducted to investigate the impact levels of outside determinants on the quality of accounting human resources for sustainability of the accounting service firms in Hanoi. Data are collected using 145 questionnaires from accounting service firms. Based on the data collected, we use Cronbach’s Alpha, EFA and regression model for learning the effect of different variables on the quality of accounting human resources. The results show that three outside determinants including International integration of accounting, Policy of accounting human resource development and Accounting labor market needs had positive relationships with the quality of accounting human resources. Based on the findings, some recommendations are given for improving the quality of accounting human resources of accounting service firms in Hanoi to ensure sustainability, including applying international financial report standard (IFRS) in Vietnam, strengthening cooperation between universities and businesses, and improving the quality of the labor market.