The Bank of Thailand will revise down its GDP growth for 2015 from 3.8% due to the slow, fragile economic recovery and growing risks.
Households and the private sector remained cautious with their spending in April while exports slowed in line with regional trade, said Roong Mallikamas, senior director of the BoT's Macroeconomic and Monetary Policy Department.
"Tourism and public spending continued to play a major part in sustaining the economy," she said.
The trend will continue in the second quarter of this year and the economy needs to draw its strengths from large government projects.
Exports will lose their status as a major economic driver in the future. Thai products are no longer popular or modern in world markets and large countries import less.
"Even when the world economy expands well, Thai exports are unlikely to benefit from the trend.
"Businesses should therefore look to neighbouring countries and expand existing markets," she said.