The Chinese Foreign Ministry said on its website Hun Sen would pay an official visit Dec. 13 through Dec. 17.
Prince Norodom Ranariddh, who returned to his party this week, is seeking cooperation with both Funcinpec and Human Right Party.
Cambodian officials say they expect Hun Sen to sign even more deals with China on this visit.
China has made great economic strides since the collapse of the Soviet Union, posting double-digit growth.
In a December report, OSJI says donors can push harder for wider indictments and great participation by leaders.
Administrators across Cambodia charge as much as $20 for documents required for marriage.
It is celebrated worldwide every Dec. 10 as Human Rights Day.
Some of the bridge survivors say they do not want to see the bridge reopened so soon—if ever.
The Mustin, which is commanded by an American-Cambodian, arrived in Preah Sihanouk province, for a five-day visit.
Cambodia and Thailand will celebrate 60 years of diplomatic relations on Dec. 19.
Cambodia has been a full member of the UN since 1955.
But a government committee said the bridge disaster was not the fault of any body or agency.