An　on-chip　solenoid　type　power　inductor　utilizing　double　layer　laminated　thin　film　cores　with　nanogranular　magnetic　materials　of　Fe-Co-Ti-O　is　presented.　Increments　of　23%　in　inductance　up　to　500　MHz　and　21%　of　quality　factor　at　100　MHz　are　obtained　compared　with　usual　solenoid　inductor　with　single　layer　laminated　thin　film　core.　And　the　L　improvement　is　proved　by　simulation　to　be　bigger　if　the　magnetic　films　have　a　higher　permeability　or　thicker　thickness.　The　influence　of　copper　winding　thickness　on　DC　performance　is　also　analyzed.　The　results　show　that　increasing　the　thickness　of　winding　coils　within　the　process　technology　ability　can　effectively　improve　the　performance　of　the　proposed　inductor　at　low　frequency.　The　coupling　coefficient　achieves　0.85　and　can　be　easily　adjusted　by　changing　the　turn　number　of　parallel　windings　to　easily　meet　the　requirement　of　circuit　design.　©　2019　IEEE.