Hundreds of people have once again taken to the streets of the northwestern Chinese city of Langzhou.
They are calling on their government to take a tougher line to be taken against Japan.
The police tried to reason with the demonstrators, but to no avail.
The army was eventually brought in and the protest broken up.
Japan has detained the captain of a Chinese trawler whose boat collided with Japanese patrol ships near a chain of islands in the East China Sea whose status is hotly disputed.
Japan is in turn worried that China is restricting shipments of rare earth metals, vital for manufacturing.
Relations between the two countries have been particularly strained since the collision last month.
However, they seemed keen to defuse diplomatic tensions at the end of last week.