The two routes for synthesis of 3,3-bis(azidomethyl)oxetane (BAMO) were compared. Solvent-free process for the synthesis of BAMO from 3,3-bis(chloromethyl)oxetane (BCMO) by phase transfer catalysis was a good method invented by Malik et al. But Sanderson et al proposed method for the synthesis of BAMO,using tribromoneopentylalcohol (TBNPA) as the raw materials,by the phase transfer catalysis in two steps，that is another good method. Using Wardle et al proposed method for synthesis of PBAMO,the product functionality and the molecular weight are controllable. Boron trifluoride tetrahydrofuran (BF₃?THF) is a very good catalyst to prerare PBAMO from BAMO.