1,1-Diam intr-3,3,5,5-tetrap henoxycyclorotriphosphasene (APP), 1,3,5-trichloro -1,3,5-trid imethylaminocyclotriphosphazene (Cl3), 1,1-d iam ino-3,3,5,5-tetra- (2,2,2-trifluoroet hoW) cyclotriphosphazene (AFEP), 1,1-d iamino-3,3,5,5-tetra-(p-chlorophenoxy ) cyclotriphosphazene (ACPP)were synthesized from hexachlorocyclotriphosphazene(PNC) and used as curing agent of epoxy prepolymers(Bisphenol A-type, diglycidyl ether EPIKOTE 828, 184-194 g/eq.) The dynamic viscoelastic properties, mechanical properties of the epoxy resin cured by photophazene derivatives were investigated. Considering the rigidity and glass transition temperature of the cured resin, the curing conditions for EPIKOTE 828/ACPP system was found to be 20$0^{circ}C$ for 8 hours. Higher glass transition temperature of the cured resin with phosphazene is always recognized when compared with that cured with conventional aromatic curing agent, m-phenylene diamine, however, Cl3 is exceptional. Although higher elastic moduli and tensile strength of the epoxy resin cured by Cl3 and ACPP has been observed at room temperature than those of the corresponding resins cured by other phosphazene derivatives, situation is reversed at the temperature above 10$0^{circ}C$ and highest value were obtained from the resin cured AVEP.