Abstract: The present invention relates to use of a pyridine urea compound having snail-killing activities, and relates to a method for preparing the pyridine urea compound. In particular, the present invention discloses a compound having the structure as shown in formula (I), an optical isomer thereof, a racemate thereof, a solvate thereof, or a pharmaceutically acceptable salt thereof, the compound having a significant killing effect on various snails as parasitic disease vectors and low toxicity to non-target organism fish.