Introduction   At present, most of the islands in China supply electricity mainly by equipping diesel generators. This form of energy supply has the problems of high cost and low efficiency of energy utilization.

    Method   According to the current situation of energy demand in an island, this paper designed a scheme of comprehensive utilization of the waste heat of diesel generator in the island from the point of view of distributed energy supply, in order to solve the problem of island energy supply.

    Result   The scheme improves the efficiency of energy utilization, reduces the pressure of island energy supply effectively, and reduces about 20% of the refrigeration cost.

    Conclusion   The scheme proposed in this paper is conducive to the improvement of energy efficiency and investment economy. It has important practical significance for improving the production and living conditions of the island.