SHANGHAI — China opened a new type of free-trade zone here on Sunday in a bid to test financial changes that the government said could eventually spread to other parts of the country.

The new zone, which has the backing of the State Council, the Chinese cabinet, was first announced last July. It is expected to allow banks and other businesses within its boundaries to experiment in areas that are tightly controlled in China, including loosening regulation of interest rates and full convertibility of nation’s currency, the renminbi.

By opening the new test zone in Shanghai, a city of 20 million and one of the country’s major financial centers, the government appears to be signaling its determination to ease restrictions on investment while also trying to press ahead with plans to open up its financial system and internationalize its currency, analysts say.

The government has not yet given a detailed outline of how the pilot zone — which covers 29 square kilometers, or about 11 square miles, of ports and logistics areas — is expected to operate. But on Friday, the State Council said foreign and private companies would soon be allowed to invest freely in banks, shipping ventures, travel agencies and health and medical insurers that are set up in the experimental zone.