This　paper　introduces　association　rules　mining　in　data　mining,　improves　classical　Apriori　algorithm,　and　uses　it　into　mining　the　relationship　of　trace　elements　of　diabetes.　The　whole　process　includes:　data　collection,　data　preprocessing,　data　mining　and　result　analysis.　This　paper　introduces　each　above　mentioned　step,　analyze　the　result　in　detail　and　effectively　use　mining　results　into　nutrition　catering　system　of　diabetes　in　order　to　help　people　eat　healthily　and　keep　them　far　away　from　risks　of　diabetes.