The invention relates to a pest control constructor and a method thereof. The constructor includes Cry2Aa protein and Cry1A protein. The pest control constructor and the method disclosed by the invention control pests through the Cry2Aa protein and the Cry1Ab/Ac protein generated in plants; the constructor and the method, compared to an agricultural control method, a chemical control method and a biological control method in the prior art, are not only strong in toxicity and thorough in effect, but also capable of preventing and controlling pests through protecting the whole plants in the whole growth period; and the constructor is free of pollution and residues, stable in effect, simple, convenient and economical.