Due to the lack of research on trade union and management, this research is conducted to determine the factors such as gender, age, education, and financial status that affect Tainan Vending Store Trade Union on organizational operation and organizational effectiveness. Further analysis of the results shows that gender of member makes no significant impact on organizational operation but significant impact on organizational effectiveness. The age, education, and financial status of the member make significant impact on both organizational operation and organizational effectiveness. Overall, organizational operation has significantly positive effect on organizational effectiveness. However, the financial utilization have a negative effect on union management, member welfare, and the relationship between the union and its members.