8μm~14μm long-wave infrared coherent radiation has important application value in many fields such as atmospheric laser remote sensing and communication, high-resolution molecular fingerprint spectrum and national security. Several kinds of optical sources which can obtain 8μm~14μm coherent radiation are summarized, including CO2 gas laser, semiconductor quantum cascade laser, infrared free electron laser, infrared supercontinuum spectrum source and non-linear variable frequency mid-infrared solid-state laser. The basic principles of different technologies and their progress at home and abroad are introduced. The advantages and disadvantages, development direction and application scope of each method are analyzed and compared. Nonlinear variable frequency mid-infrared solid-state lasers have outstanding advantages of 8μm~14μm continuous tuning, femtosecond, picosecond, nanosecond and continuous wave operation, and 1Hz~GHz tunable repetition frequency. Full solid structure, high reliability and good beam quality are also obtained. It will be the best choice for developing practical and precise long-wave infrared coherent radiation sources.