High-nitrogen energetic compounds (HNECs) including tetrazines, high-nitrogen furazas and trizoles (or tetrazoles) have characteristics as higher positive heat of formation, better oxygen balance, higher density, and lower sensitivity. The usual synthesis methods of HNECs, and the synthesis route for typical HNECs，including BT, DAAzF and BHT are reviewed. And then some ideas to synthesize new HNECs from non-symmetrical molecular design direction are suggested, i.e. interlinkage between the tetrazine and the farazan, the tetrazine, the pyrazole.