CRC composed of insect repellent cake and clay insulation pottery to improve the health problems caused by mosquito bites to farmers, and reduce the problem of coffee beetles eating coffee and affecting the quality of coffee. CRC's insect repellent cake is made of agricultural waste coffee peels with herbivorous animal dung. Just put the insect repellent cake into the pottery and ignite it, then the insects can be repelled. Coffee peel contains caffeine, and dried herbivorous animal dung contains grass fragrance and smoke can effectively repel insects, protect farmers and coffee trees, and forms a friendly planting cycle.