Li said that China had already passed the "stress test", and will achieve the targeted economic growth -- 6.5 to 7 percent.
"It impossible that China's economy will grow under 6.5 percent," Li said at a press conference on the last day of China's parliament session.
"We are confident about a bright future and our confidence is not based on flimsy grounds. The big markets in China have enormous potential," the prime minister said.
China is battling its slowest economic growth rate in 25 years.
The world's second-largest economy grew by 6.9 percent in 2014. This year, the government has pegged the growth rate between 6.5 and 7 percent.