A　micro　inductance　sensor　model　based　on　the　software　of　Maxwell　to　detect　the　debris　in　oil　is　presented.　The　model　is　built　to　study　the　detecting　performance　of　sensors　with　different　turns　and　enwinding　styles.　It　can　be　demonstrated　that　the　planar　coil　with　15　turns　has　a　better　sensitivity　to　detecting　metal　debris　with　about　100　micro　meters　in　size.　The　solenoid　coil　with　20　turns　has　a　better　performance　to　detect　the　micro　metal　debris.　This　simulation　shows　that　the　detecting　performance　of　a　sensor　is　related　to　its　parameters　such　as　the　size,　turns,　style　of　enwinding.The　optimization　of　coils　for　the　detection　of　metal　debris　with　100　μm　in　size　is　presented　at　last.　©　(2013)　Trans　Tech　Publications,　Switzerland.