By adopting coprecipitating method, the green primary explosive ferric styphnate-ferric hypophosphite (FSFH) was synthesized from styphnate-ferric and sodium hypophosphite. The thermal and explosive properties(impact, friction, flame, electrostatic spark sensitivity, the minimum initiating charge) were studied. The results show that FSFH is high friction sensitivity with 50 angle and 100% fire. The FSFH and lead azide are almost equal in impact, flame and electrostatic spark sensitivity. The thermal decomposition peak of FSFH is 205.88 ℃ with initial temperature of 185.36 ℃, which indicates that FSFH is weak primary explosive and can be used as primer charge and stab initiating composition.