A molecular N2 laser with the first positive band (B3πδ-A-3∑u+ tran-sition) is reported. The laser can operate stably at 0.8913 or 1.051 μm in TEM00 mode. It can also operate stably at 337.1 nm if the cavity and other conditions are changed. Its electrical pulse width and laser pulse width (FWHM)are nearly 300 ns to 100 ns.Injecting the 1.051μm single mode laser light into a Nd3+: phosphate glass laser, amplified laser pulses have been observed.