"This new constitution of the Bolivian state wants to give everybody the same opportunities, the same rights and the same duties. And there shouldn't be exclusion anymore," he said in the capital La Paz on Saturday.
The changes are widely expected to pass as Morales enjoys the support of the majority of the country's six million indigineous Amerindians.
Morales won 67 per cent of the vote in a recall referendum in August 2008.
"Evo Morales will win, because he is a good president and he is helping children and old people. So we will vote 'yes'," Norita Manami, a Morales supporter, said.
State control
The proposals include a larger state role in the economy, grants of self-rule to 36 distinct indigenous "nations" and a December general election, in which Morales could run for another five-year term.
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Elections: Presidents would be allowed two consecutives five-year terms
Indigenous rights: Recognises self-determination of 36 'nations' and sets aside seats in Congress
Natural resources:
State control for all gas, oil and mineral reserves
Local autonomy: Authorises state assemblies that control local issues and self-rule for indigenous groups on traditional lands
Justice: High court judges to be elected rather than appointed
Equality: Prohibits discrimination on sexual orientation and guarantees freedom of religion
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Voters will also decide whether future land ownership should be capped at 5,000 or 10,000 hectares. The state could seize land that does not perform a "social function" or was fraudulently obtained.
But despite strong support for Morales, the vote could prove divisive with the country split along geographic, racial and class lines.
The opposition, led by state governors in the more prosperous east, has objected to the proposed changes.
Many critics have accused Morales of harming the economy through the nationalisation of a number of businesses.
"This is a false referendum, it does not have the participation nor the support of half of the Bolivian people. We people from the east [the lowlands of Bolivia] don't expect anything good from it," Percy Ruiz, an opponent of Morales, said.
However, it allowed the referendum to go ahead after Morales agreed to stand for only one additional term and grant greater autonomy to the regions.
Nearly four million Bolivians are registered to vote in a referendum which is to be monitored by international observers.