Benedict reagent, also known as Benedict reagent, Benedict reagent, Benedict reagent or Benedict reagent, is a light blue chemical reagent, which is often used to identify urine sugar. Its formula is different from that of Linfei reagent: ① 85g sodium citrate and 50g anhydrous sodium carbonate are added into ①400ml water; (2) adding 8.5g anhydrous copper sulfate into (2) ②50ml hot water to make solution; (3) Pour the solution into the sodium citrate solution and stir while adding. If precipitation occurs, it can be filtered out. (2) Its reaction principle is slightly different from that of Linfei reagent. When identified by Linfei reagent, Linfei reagent A and Linfei reagent B directly react to form brick red precipitate, while in Banff reagent, the formation is as follows: sodium citrate and sodium carbonate are both strong base and weak acid salts, which can be hydrolyzed in water and combined with sodium citrate solution and solution.