After a long period of high and stable economic growth, the Vietnam’s economy is experiencing difficult time that the inflation is considered as the main reason for. To solve the situation, the Vietnam’s government has continuously introduced series of aggregate demand management policies relating restraining the inflation or boosting the economic growth. This paper uses the quantitative methodology to analyze the relationship between the growth and the inflation in Vietnam and the input - output system by W. Leontief to analyze the periodical structure of the economy. Hence it would be possible to identify the cause for the economic growth and raise some implications to the policymakers.