The regularities of transformation of lignites from Karaman-Ermenek deposits of Turkey under accelerated electron impact have been studied. The absorbed doze in lignites changed within the limits of 1170-3120 kGy. As basic indexes of process rate of gas formation, decrease of initial mass of lignite and the contents of sulfur in the solid have been defined. The gaseous products Н2 , CO and СН4 were identified. The specific features of radiation-chemical decomposition of organic mass of lignite under accelerated electrons impact are discussed