The generation of hollow beams were demonstrated by using a plasma channel induced by pump pulses. A plasma channel will be generated as femtosecond pulses propagating in the nonlinear media, the distribution of refractive index in the plasma channel induced by pump beams is similar to a graded-index lens, besides, laser beams can only propagate in the plasma if the electron density of the plasma is less than the critical value, the probe beam is refracted and transformed into a hollow beam when it passes through in the periphery of the plasma channel. It finds that the probe beam begins to transform into a characteristic hollow beam structure when the power is 8 mW. When the power or repetition rate of the pump beam and the electron density in the plasma channel are changed, the region of the plasma where the probe beam can pass through is also changed, resulting in a controllable dark spot of the hollow beam.