Abstract: This work demonstrates the designs and synthesis of covalent triazine-based frameworks（CTFs）made by triazine cores and a series of functional thiophene units. The structure and basic properties of products were characterized by IR，UV-vis，SEM，TG and BET， and the microdomain morphology， structure， thermal stability， pore size distributions and optoelectronic properties of the product were compared. The results demonstrated an obvious enhance in thermal stability and changed pore size distributions and optoelectronic properties with the increasing number of thiophene units，but the relationships between the number and the properties were not a simple linear change as a conclusion.

Key words: covalent triazine-based frameworks, thiophene units links, polymerization