Since reform and opendoor policy, opening to outside world has developed rapid ly but unevenly in China Some researchers have studied economic opening rate o f China, but rarely studied the spatial disparity of economic opening rate Thi s paper employs statistical data in 1990 and 2000 and measures economic opening rate of all provinces (autonomous region or directlyaffiliated municipality) o f China It is exposed that since 1990 economic opening rate of most provinces of China has risen obviously and the rank has changed slightly, bu...