1, under the premise of laws and regulations, operating under the provisions and terms of the tax law; 2, according to the law, according to the enterprise situation, according to the nature of the enterprise industry, under the tax law to use the existing preferential, relief, preferential conditions; 3. If the current enterprise does not have preferential measures of tax law, in order to maximize the value of the enterprise, under the premise of not breaking the law, change the business model of the enterprise, change the transaction mode of the enterprise, and change some external forms of the enterprise, so as to make the enterprise suitable for the existing preferential measures.