Objective A method was developed for measuring gross alpha radioactivity and gross beta radioactivity at the same time in food. Methods Sample was prepared after drying, coking, ashing, and the counting rate of gross alpha and beta in sample was measured through the low background alpha and beta measurement system, and quantitative comparison was made with the standard source measurement efficiency. Results The detection limit of gross alpha was 0.160-5.31 Bq/kg (fresh weight). The recovery was 82.7%-101.8%. RSD was 5.65%-7.26% (n=5). The detection limit of gross beta was 0.475-9.29 Bq/kg (fresh weight). The recovery was 88.8%-114.8%. RSD was 2.23%-9.19% (n=5). Conclusion This method could determine the gross alpha radioactivity and gross beta radioactivity in food at the same time, simply, efficiently, and is suitable for total radiation monitoring of the batch food sample.