Abstract: Using a mixed methods approach, this study examined reunification processes and outcomes among Vietnamese immigrant families involved in the child welfare system. A quantitative design was used to describe characteristics and reunification outcomes of Vietnamese immigrant children and families who are involved in family reunification services. Qualitative methods were used to explore factors that may influence reunification outcomes among Vietnamese families. The quantitative portion of the study included an exploratory design using administrative data from one county in the Northern California. The quantitative sample (N=32) included children entering the foster care system for 8 or more days between January 1, 2001 and December 31, 2007 from child welfare administrative data(CWS/CMS) which was merged with eligibility data (CalWIN) in order to obtain parent and child place of birth to determine country of origin. The qualitative study included an exploratory design using interview data from child welfare workers (N=8) and Vietnamese immigrant parents who had successfully reunified (N=7).Quantitative results indicated that the most common type of maltreatment leading to entry into care was caretaker absence or incapacity, an abuse category that is often used in cases of parental substance abuse. 53.8% of Vietnamese immigrant children in the quantitative sample reunified with their parents,which is close to the national rate of reunification. Qualitative findings pointed to the importance of the following factors within reunification: acculturation-related issues, parental substance abuse, child welfare worker cultural competency and issues related to service availability and effectiveness. Implications for social work practice and policy are discussed.