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The national income accounting measurement is one good method to help any development countries to research whether what issues are their weaknesses or strengths is order to improve their economic development challenge. The central concept in national accouting is to measure the total output of products or services of the country's economy over a given time period.The measure is known or gross domestic product (GDP). Output is produced by employing various factors of production ( mainly labor and captial), and the revenue from sale of output of used to make payments to these factors of production. The value of output is identified, to the value of income paidout, or what is known as national income. Since the output produced is sold ( or added to stocks), the value of output is also equal to the value of expenditure.Hence, GDP can be regarded as the value of output produced ( aggregate supply), the total value of expenditure on output ( aggregate demand) or the total value of income in producing the output (real income). So, any developing countries can find whether how much or amount different industries value of output produced from and the real aggregate demand from consumers for different industries' products sale number or services demand in order find whether what factors cause the kind of industry's total GDP product sale number and real income reduction amount. For example, last year, the developing country's cloth industry sale number has 600,000 pieces and real GDP income has US$5 million. But, this year, its cloth industry sale number has 400,000 pieces and real GDP income has US$ 2 million. Hence, the developing countries can know its current year overall cloth industry sale number and GDP real income must reduce. Then, this country can attempt to find any factors had influenced itself cloth industry why this country itself cloth buyers number and their wearing demand has reduced. the reasons may include overall cloths price is exceed the normal price le