"It is fully justified to ask if Japan is going to give up its exclusively defence-oriented policy", China's foreign ministry spokeswoman Hua Chunying said in a statement.
"We solemnly urge the Japanese side to... Refrain from jeopardising China's sovereignty and security interests or crippling regional peace and stability," Hua said in the statement posted on the ministry's website.
Hua described the passing of the bills as "an unprecedented move since the Second World War".
Beijing -- which is also embroiled in a territorial row with Tokyo over disputed islands in the East China Sea -- regularly accuses the government of Prime Minister Shinzo Abe of showing insufficient contrition for the conflict.
Hua referred to the 70th anniversary of Japan's defeat in its conflict with China, which Beijing calls "the Chinese People's War of Resistance Against Japanese Aggression."
"We solemnly urge the Japanese side to draw hard lessons from history," she added.
China's official Xinhua news agency also condemned the move, saying it meant "a nightmare scenario has come a step closer for Japanese people and neighbouring nations".
If passed, the bill will "tarnish the reputation of a nation that has earned international respect for its pacifist Constitution over a period of nearly seven decades", it said.
The remarks come despite attempts to improve relations between China and Japan, with China's President Xi Jinping meeting twice with Abe.
China has increased the speed of its military spending at double-digit percentage rates for decades, prompting concerns from neighbouring countries.
It has held a number of military exercises near Japan, with Beijing's navy completing its first circumnavigation of the country in 2013.
China's defence ministry said its army planes in May for the first time flew over the Miyako Strait, between Japan's Miyako and Okinawa Islands.
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