Book is collection of independent articles Small inertial Fusion Reactors. The author offers the new, small cheap electric impulse and cumulative thermonuclear reactors, which increases the temperature and pressure of its nuclear fuel by millions of times, reaches the required ignition stage and, ultimately, constant contained thermonuclear reaction. AB Reactors contain several innovations to achieve its product. Author offers a new capacitor as driver Inertial Thermonuclear Reactors. The main advantages of the offered method are small of the full reactor, using the many thermonuclear fuels at room temperature and possibility of using the offered thermonuclear reactor for transportation. Author gives theory and estimations of the suggested reactors. Author also is discussing the problems of converting the received thermonuclear energy into mechanical (electrical) energy and into rocket thrust.