The database will record information about elderly Alzheimer's patients, Xinhua reported.
People of Tianjin will be free to register relatives who have been diagnosed with the disease, said an official from the Tianjin Hetong Elderly Welfare Association.
The elderly people registered will wear a special bracelet that will help in their identification.
Officials said the database will also serve as a communication platform where family members can share their experience in taking care of patients, as well as obtain help if their relatives are lost.
Around 10 million Chinese suffer from Alzheimer's disease, accounting for one-fifth of the world's Alzheimer's patients, according to official figures.
As of 2011, China had about 185 million people over the age of 60, or 14 percent of the population.
By 2053, the number of senior citizens in China is expected to hit 487 million, or 35 percent of the population.