The aim is to build a healthy and harmonious online environment that does not poison young people's minds, according to the directive.
Mr Qin defended the move on Tuesday: "The purpose of this is to effectively manage harmful material for the public and prevent it from being spread," he said.
"The Chinese government pushes forward the healthy development of the internet. But it lawfully manages the internet," he added.
The Chinese government regularly restricts access to certain internet sites and information it deems sensitive.
The BBC's Chinese language website and video sharing website Youtube are currently inaccessible in Beijing.
Critics fear this new software could be used by the government to enhance its internet censorship system, known as the Great Firewall of China.
But a spokesman for one of the companies that developed the software, Jinhui Computer System Engineering, rejected this accusation.
"It's a sheer commercial activity, having nothing to do with the government," Zhang Chenmin, the company's general manager, told the state-approved Global Times newspaper.
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