A higher threshold is set for foreign insurance companies to enter the Chinese market, according to the revised management rules concerning foreign insurers' representative offices in China, the China Daily reported.   The new rules released by the China Insurance Regulatory Commission (CIRC) on July 21 and will come into effect as of September 1, 2006.   The new rules stipulate that foreign insurance institutions should have at least 20 years of continuous experience in running an insurance business to qualify for a license to set up a representative office in China.   Foreign companies running non-insurance businesses should have a business history of more than 20 years.