Test systems of Global Navigation Satellite System (GNSS) ground control segment are important guarantees for system performance. A single test system cannot thoroughly support ground control segment tests both in the construction and operation phases. Based on this problem this paper proposes a test support system architecture, which could provide solutions for ground control segment tests. The paper firstly analyzes the test demands of the ground control segment in construction phase and operation maintenance phase. Then the architecture of test support systems is proposed. Moreover, implement and application of the architecture for different tests tasks in different phases are given. Analytical results demonstrate that the proposed system architecture which could fulfill the test demands of the whole ground control segment is practical, flexible and scalable. The results in this paper could provide references for the GNSS ground control segment tests and relative test system construction.