The junta, known as the National Council for Peace and Order (NCPO), will remain in power along with a government that is set to be appointed by September, said army chief Gen Prayuth Chan-ocha, who led a May 22 coup that overthrew an elected government.
Prayuth, speaking during his weekly TV programme, said the interim charter will have 50 articles and will balance the power between the NCPO and the transitional government.
Prayuth said the interim charter would balance the power of the NCPO and the interim government.
He admitted that the provisional constitution would have some restrictions but the restrictions would still be necessary for solving the country's problems.
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"If there are normal (democratic) solutions that are wanted by many sides put in place in the covenant, then problems cannot be solved. The NCPO needs an opportunity and the tools to work this all out," Prayuth said.
In the balance of power, the NCPO would remain in power to take care of security affairs while the government would be in charge of administering the country.
The army seized power on May 22 in a bloodless coup, overthrowing a government elected by a majority of voters three years ago.
Prayuth has said the coup was necessary to restore order after half a year of anti-government protests and political turmoil that left at least 28 people dead and the government paralysed.
Since the coup, several people have been detained in an apparent crackdown on dissent by the junta.
The Shinawatra family enjoys strong support in rural and northern areas, leading to their successive election wins.