The experimental observation of defleCtion of an approach monochromatic velocity atomic them using travel-wave field resonance-radiation pressure is reported and the theory analysis is Presented in this peper. In experiment, the deflection distance of the approach monochromatic velocity atomic beam is about 1.7 mm when the atomic beam interacts with a oblique incident travel-wave laser beam with detheing-100 MHz and the Δv is less than 58 m/s.