The relationship within a trade union reflects the common interests of the working class and the conflicts of interests among different groups of workers. It also reflects the ideas and practices of union leaders, and the theories of scholars. The influence of globalization on the trade union is mainly manifested in three aspects: decreasing unionization rate, more complicated relationships within the union and more internationalized solidarity. Global economic recession may result in worse union relations but more common interests for the workers. Meanwhile, more conflicts may emerge among workers, which results in more disagreement within the trade union. The union's conflicts lead to weak labor legislation and poor collective bargaining, while solidarity results in stronger labor legislation, more powerful collective bargaining, higher salaries and better working conditions. Hence, trade union solidarity should be reinforced, and communication and cooperation should be promoted.