To explore the application possibilities of polyglycidyl nitrate plasticizer (PGNN) in propellants and PBX explosives, a series of PGNN with different number average molecular weight were synthesized. The relationships between molecular weight and density, viscosity, glass transition temperature and volatility were studied. The compatibility of PGNN with the main components of propellants and explosives were investigated by TG, and the hazard during storage and transportation were studied by sensitivity test and transport vibration test. Results show that PGNN with molecular weight of 523 has a higher density (1.43 g·cm^-3), lower glass transition temperature (-56 ℃) and lower volatility (60 ℃, 0.096 mg·cm^-2·h^-1). PGNN is compatible with HMX, RDX, AP and Al etc., and has good safety characteristics. Both the friction sensitivity and the impact sensitivity are 0, and no combustion or explosion occurs during the 4 hours of simulated highway transportation test. This research reveals that PGNN with molecular weight of about 500 is an ideal oligomer plasticizer.