In this work, we will show that electrons can be accelerated in the plasma channel, which is formed by a laser pulsereflected from a dense plasma. Preplasma, on the one hand, mast have a sufficient length in the low (<0.1nc) densityregion to create a channel inside it, and on the other hand, does not lead to strong absorption and destruction of the laserpulse and provides injection of the maximum number of electrons into the channel. It is shown that in order to fulfill thelatter conditions, the optimum slope of the plasma gradient near the critical density should be ～ 0.5λ. In this case, theinjection of electrons, which received an initial acceleration after the breaking of plasma waves excited by parametricinstabilities, effectively occurs in the plasma channel.
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