The monitoring of “low height， slow speed， small size” aircraft is a technical problem in the opening of low-altitude airspace， which restricts the development of general aviation. This paper designs a low-cost， small-volume and low-power navigation communication equipment for “low， slow and small” aircraft. The equipment integrates GPS、 Beidou， Galileo navigation source and Beidou short message communication functions. Using the civil aviation ADS-B communication data chain and Beidou short message receiving system， it not only brings “low， slow and small” aircraft into civil aviation communication navigation surveillance/air traffic management（CNS/ATM） supervision system， as well as avoids the operation risk of large aircraft in the fusion airspace， but also solves the problem of wireless signal loss in the case of obstacle occlusion and hyper-range. At the same time， track extrapolation and error correction techniques are used to ensure the accuracy of aircraft track continuity and position accuracy. A car and a light aircraft are deployed to carry on the flight comparison verification， and the results demonstrate that the function and the performance are superior to the existing ADS-B airborne communication and navigation equipment. This equipment provides a technical solution to “visible， identifiable and disposal” low altitude airspace aircraft.