Social Welfare Information System was implemented in Social Affairs Bureau of Kaohsiung City Government and now well functioning since August, 2002. This research mainly investigated the key factors of this system and can be referred as a successful experience of conducting similar systems to other governmental institutions . Results of this research are as following: 1. Strengthen the drive of conducting system through adoption of non-enforcement strategy, concordance with officers¡¦ policies and replacement of punishment for encouragement. 2. Well social relationship and intercommunication between people have positive influence in conducting system. 3. Mutual dependences: highly mutual dependences can gather users and conductors as a group to reach the consensus of strengthening system conducting. 4. Trust degree: users deeply trust conductors and system can affect system conducting. 5. Entrustment: higher entrustment causes lower resistance due to the interdependence of entrustment and system conducting. 6. Social influence: internet and well social behavior can reduce the obstruction in system conducting. 7. Participation of policy decision and open communication: well communication and participation of policy decision for users make a fine progress of system conducting. 8. Interaction and attitude of initial stage: well interaction includes communication, coordination, counseling, problem solution, which can helpfully support the system conducting during initial stage. According to research results mentioned above, researcher drew a conclusion of these factors had great influences in conducting Social Welfare Information System. In addition to conductors¡¦ efforts, active cooperation of users also plays an important role in it. Effective factors found in this research can be the reference of successfully conducting similar systems to governmental institutions.