Abstract: Based on the separating principle of the spiral chute, a new spiral chute consisting of rough concentration, cleaning and scavenging is designed in order to solve the problem which exists in the ordinary spiralchute in ore dressing plants. The rough concentration chute is placed on the top of the new spiral cbute; cleaningand seavenging connected eath other are placed under it. The rough concentration, cleaning and scavenging spiral chutes all have different structural parameters. An artificial mixture of magnetite and quartz (grain size rangeis-0. 15～0mm) is treated using hoth the new spiral chute and the ordinary one. The results show that the oredressing efficiency, the grade of concentrate and the recovery of the new spiral chute is 7. 1%, 2. 38%, 5. 47and 5. 47% respectively higher than those of the ordinary spiral chute.