Charge stratification of the combustible mixture through separate input of air and gasoline in the two-stroke gasoline engine is studied. Clean air enters the upper part of the vent channels through the check valve plate and then goes into the crank camera. The mixing occurs in the crank chamber and is controlled by the time and duration of the fuel injection nozzle. Before blowing cylinder volumes of the purge channels are filled mostly with clean air. The volume of the crank chamber is filled with a mixture of gasoline and air. Blowing the working volume of the cylinder is carried out mostly by clean air volumes from the purge channels. The process of purging is completed by filling the cylinder with fresh mixture from the crank chamber. Layer-by-layer purging of the cylinder greatly reduces the direct losses of fuel into the exhaust system. This leads to increased fuel efficiency of the two-stroke engine and reduces environmental pollution. Maximum power is achieved for mixtures with air ratio α =1.0, the best efficiency on the poorer mixtures with α =1,2-1,25. In this case the reduction of fuel consumption is up to 20 %.