At present，underwater compressed air energy storage （UW-CAES ） is mainly used in isolated island power grids of islands or ports.Firstly，inland abandoned mine pit lakes are utilized to establish large-scale UW-CAES gas storage chambers，and an integrated energy system on land with UW-CAES is constructed.Secondly，a new heat supply mode is proposed，which realizes the power and heat storage integration of the energy storage system through the coordination of heat supply between the heat storage tank and the heat pump.Finally，the effects of operating cost，system benefit，wind power consumption，and low-carbon emissions of the integrated energy system in the pit lake area are considered comprehensively，and the model is optimized with multiple objectives.The test case simulation is carried out through the IEEE 6-node distribution network and 8-node heat supply network.The results show that the integrated energy system with UW-CAES is applied to inland grid-connected operation，solving the problem of low energy storage efficiency of traditional constant-volume compressed air energy storage caused by the compressor and turbine operating at off-rated variable ratios.At the same time，it effectively reduces the output of coal-fired units and the system ’s carbon emissions.The new heat supply mode converts excess wind power into heat energy through the heat pump and recycles it through the heat storage tank，improving the system ’s wind power consumption capacity and reducing the wind curtailment rate.The heat energy recovered in the heat storage tank is supplied to the heat load，reducing the frequency of the heat pump purchasing electricity from the power grid to supply the heat load，thereby reducing the power purchase cost of the energy station and increasing the net profit of the energy station，which has good economic performance.