The theory of Economics of Language holds that the relationship of language learning and language application is just like investment and benefit. Business English teaching is an investment that can bring economic benefits, so we should try to get a higher return with a lower cost. With an analysis of economic value of business English practical teaching, this paper puts forward some principles and strategies for business English practical teaching. Optimizing the allocation of education resources and establishing a practical teaching system highlighting both language skills and business practice can maximize the economic benefit of Business English education.