An evaporation method for heating a pest controlling heat evaporation object 1, the heat evaporation object 1 includes a plate-shape carrier 2 and a bag body 3 sealing the carrier 2 from one side of the carrier 2, thereby the heat evaporation pest controlling ingredient contained in the carrier 2 is evaporated from another surface of the carrier 2 through a opening 41 forming on the bag body 3, the characteristic of the evaporation method is in that the carrier 2 remains the squeezing state squeezed from the other side by a squeezing tool during heating process.