Abstract: How to realize the rapid inter-AP hard handoff has become one of the key technologies for WiFi based onboard Internet applications，because the communicating link is always disrupted suddenly with the current AP by the obstacles and etc in the fast moving scenario.This problem may be resolved by a multi-radio based inter-AP handoff approach which bonds two wireless NICs to the virtual one, and switches the active link to slave when the master link is detected to be disconnected.To validate the feasibility of the approach，a hard inter-AP handoff testbed is built up and serials of experiments are carried out with the hard inter-AP handoff process triggered by changing the status of the current AP.Experimental results show that the handoff approach can decrease the hard handoff latency to 300~400 ms，and the negative influence on the throughput can almost be ignored during the hard handoff process.