[en] The self-generated magnetic field, the angular and energy distributions of hot electrons produced in the interactions of ultra-short laser pulse with plasmas are studied in various experimental parameters. The spatial and temporal evolution of femtosecond laser plasmas are diagnosed by using optical probe beam. The average value of the magnetic field was estimated to be as high as 1.0 +- 0.3 MG in underdense plasma region. It is believed that this axial magnetic field is related with the dynamo effect in laser-plasma interaction. The hot electrons escaped from plasma show very high directionality, and their energy distribution have two Maxwellian components