A　cascaded　deadbeat　predictive　control　strategy　with　online　disturbance　compensation　is　proposed　for　a　three-phase　interleaved　boost　converter　in　this　paper.　The　topology　of　the　three-phase　interleaved　converter　is　symmetric,　so　the　inner　loop　controller　is　also　designed　symmetrically.　For　the　purpose　of　realizing　the　error-free　tracking　of　reference　value,　the　deadbeat　predictive　control　method　is　adopted　for　inner　and　outer　loops　with　Luenberger　observers,　which　are　designed　to　estimate　and　compensate　the　disturbances　of　load　variation　in　the　power　model　as　well　as　the　unknown　resistor　of　inductance　in　the　current　model.　To　eliminate　the　influence　of　a　time　delay,　a　two-step　predictive　control　method　is　adopted　in　the　predictive　model.　In　the　aspect　of　parameter　design,　the　pole　placement　method　is　adopted　to　determine　the　gain　of　the　observer.　A　series　of　simulations　and　experiments　are　carried　out　to　test　the　proposed　strategy　under　steady　and　dynamic　conditions.　It　is　shown　that　the　proposed　control　strategy　has　faster　dynamic　response　and　stronger　robustness　against　disturbance　than　the　conventional　model　predictive　control.