President Xi Jinping's speech discouraged Chinese traders who were looking for indications of a move away from Covid Zero and further help for the struggling real estate market, which led to a fall in stock prices.
After a rise on Friday due to excitement around the twice-decade Party Congress.
Xi's reaffirmed commitment to technological independence provided some relief to the industry, but generally.
The onshore benchmark has lost more than 22% of its value so far this year as investors struggled with the slowing economy and escalating antagonism between the US and China.
The second-weakest rate in more than four decades, according to economists polled by Bloomberg, is just 3.3% growth this year.
Markets could be frustrated that Covid-Zero policy looks to remain unchanged and that an exit strategy is unclear