In response to the difficulty of achieving high spatiotemporal resolution measurements of boundary layer flow velocity using existing techniques, the femtosecond laser-induced cyano chemiluminescence speed measurement technique (FLICC) has been proposed. This technique employs femtosecond laser pulses to generate filaments in a methane / nitrogen mixed flow field, inducing intense and long-lived cyano radical CN (B-X) fluorescence as a tracer marker, thereby enhancing signal quality and extending the temporal tracking window to enable high-precision velocity measurements within the boundary layer. Experimental results demonstrate that the FLICC technique can effectively adapt to complex flow environments and successfully achieve high spatiotemporal resolution measurements of low-velocity flow fields in the boundary layer region, with the lower limit of velocity measurement reaching as low as 5 m / s. This provides a new high-precision diagnostic tool for flow field velocity measurements in fluid dynamics and aerospace research.