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In this letter we consider spinless bosons in a Kagome lattice withnearest-neighbor hopping and on-site interaction, and the sign of hopping isinverted by insetting a {\pi} flux in each triangle of Kagome lattice so thatthe lowest single particle band is perfectly flat. We show that in the highdensity limit, despite of the infinite degeneracy of the single particle groundstates, interaction will select out the Bloch state at the K point of Brillouinzone for boson condensation at the lowest temperature. As temperatureincreases, the single boson superfluid order can be easily destroyed, while anexotic triple-boson paired superfluid order will remain. We establish that thistrion superfluid exists in a broad temperature regime until the temperature isincreased to the same order of hopping and then the system turns into normalphases. Finally we show that time of flight measurement of momentumdistribution and its noise correlation can be used to distinguish these threephases.

Superfluidity of Bosons in Kagome Lattices with Frustration