US business groups are seeking "urgent discussions" over new Chinese rules requiring foreign firms to hand over source code and other measures.
The groups wrote to senior government officials after the introduction of the cybersecurity regulations at the end of last year.
The US Chamber of Commerce and other groups called the rules "intrusive".
The regulations initially apply to firms selling products to Chinese banks but are part of a wider review.
"An overly broad, opaque, discriminatory approach to cybersecurity policy that restricts global internet and ICT products and services would ultimately isolate Chinese ICT firms from the global marketplace and weaken cybersecurity, thereby harming China's economic growth and development and restricting customer choice," the letter read.
The groups said that the rules would force technology sellers to create backdoors for the Chinese government, adopt Chinese encryption algorithms and disclose sensitive intellectual property.
Firms planning to sell computer equipment to Chinese banks would also have to set up research and development centres in the country, get permits for workers servicing technology equipment and build "ports" which enable Chinese officials to manage and monitor data processed by their hardware, Reuters reported.
Source code is the usually tightly guarded series of commands that create programs. For most computing and networking equipment, it would have to be turned over to officials, according to the new regulations.
In the letter, a copy of which has been seen by the BBC, the groups have asked the Chinese government to delay implementation of the regulations and "grant an opportunity for discussion and dialogue for interested stakeholders with agencies responsible for the initiatives".
They added: "The domestic purchasing and related requirements proposed recently for China's banking sector... would unnecessarily restrict the ability of Chinese entities to source the most reliable and secure technologies, which are developed in the global supply chain," the letter, which was dated 28 January, read.
The letter from the American groups, including the US Chamber of Commerce, AmCham China and 16 others, was addressed to the Central Leading Small Group for Cyberspace Affairs, which is led personally by Chinese President Xi Jinping.
It comes at a time of heightened tension between the USA and China over cybersecurity. In May last year, Beijing denounced US charges against Chinese army officers accused of economic cyber-espionage.
It was also alleged that the US National Security Agency spied on Chinese firm Huawei, while the US Senate claimed that the Chinese government broke into the computers of airlines and military contractors.
American tech firms, such as Cisco and Microsoft, are facing increased pressure from Chinese authorities to accept rigorous security checks before their products can be purchased by China's sprawling, state-run financial institutions.
Beijing has considered its reliance on foreign technology a national security weakness, particularly following former National Security Agency contractor Edward Snowden's revelations that US spy agencies planted code in American-made software to snoop on overseas targets.
The cyber-space policy group approved a 22-page document in late 2014 that contained the heightened procurement rules for tech vendors, the New York Times reported on Thursday.