There is a harmful organism that cannot be controlled or is difficult to be controlled with the use of a single agent of a compound represented by the general formula (1) according to the invention, an insecticide, a miticide or a fungicide. Accordingly, an object of the invention is to provide a composition for preventing harmful organisms for efficiently controlling such a harmful organism. That is, the invention is directed to a composition for preventing harmful organisms, characterized by comprising the compound represented by the general formula (1) and other insecticides, miticides or fungicides as active ingredients, ##STR00001## wherein, in the formula, A.sub.1, A.sub.2, A.sub.3 and A.sub.4 independently represent a carbon atom, a nitrogen atom or an oxidized nitrogen atom, G.sub.1 and G.sub.2 independently represent an oxygen atom or a sulfur atom; R.sub.1 and R.sub.2 independently represent a hydrogen atom or a C.sub.1 to C.sub.4 alkyl group; Xs may be the same or different and represent a hydrogen atom, a halogen atom or a trifluoromethyl group; Q.sub.1 represents a substituent such as a phenyl group or a heterocyclic group; and Q.sub.2 represents a substituent such as a phenyl group or a heterocyclic group.)