The economic concept of economic spillover is applied towards digital investments and thus can be used to provide prediction of changes of national income from digital economy sector. A white paper study from Huawei Technologies provide a model for potential spillover from digital investments of 0.84 times the amount of digital investments, conditional to the nature of the government's digital strategies be conductive of digital integration in economic activities. This paper conducts expert review of Thailand's Digital Economy Policy and determine whether the policy support digital integration in economic activities. The results show that the policy support digital integration and could lead to 0.84 times spillover to the economy based on the amount of digital investments in Thailand and considered to be the value of digital economy in Thailand.