In this paper, a model of electron electromagnetic radiation is established by using Lorentz formula for the interaction of a tightly focused elliptically polarized laser with a single electron under the condition of nonlinear Thomson scattering. Let the initial pulse width λ0 be 3.3fs. By changing the laser pulse width λ0, the energy distribution and space distribution of electron radiation emitted by electron under different conditions are obtained. The results show that when laser interacts with a single electron, the electromagnetic radiation emitted by the electron accumulates in a cone shape in space. With the increase of pulse width λ0, the peak energy of electron radiation is bimodal, and the peak power of electron radiation drops. At the same time, the longer it takes for the electron radiation to reach the peak, the frequency spectrum and time function show that the high-frequency component decreases, the cutoff frequency decreases, and the harmonic frequency increases.