Iran and Saudi Arabia have at last come to terms over the Hajj pilgrimage and in 2017 Iran will start to send people to Mecca, after a 2-year standstill.
The hajj ritual has created a lucrative business in Iran.
He said the agreements worth almost $65 billion and signed by the two sides embodies promising future aspects of cooperation between the two countries.
Ahmed Al-Rajihi, board chairman of Riyadh Chamber of Commerce and Industry (RCCI), said the king's visit to China opens a new chapter in Saudi-Chinese strategic relations.
"The ministry of hajj and the Iranian organization have completed all the necessary measures to ensure Iranian pilgrims perform hajj 1438 according to the procedures followed by all Muslim countries", Saudi Arabia's official SPA news agency quoted the Saudi Hajj ministry as saying on Friday.
Iranian pilgrims did not participate in the Haj a year ago for the first time in almost three decades, after Riyadh and Tehran failed to agree on security and logistics.
Days after the deadly human crush, which occurred in September 2015, Saudi Arabia published a death toll of 770 but refused to update it despite gradually surging fatality figures from individual countries whose nationals had been among the victims of the crush.
Saudi Arabia & China sign trade agreements worth billions of dollarsChina and Saudi Arabia signed agreements potentially worth tens of billions of dollars on Thursday, Beijing said, as President Xi Jinping welcomed Saudi King Salman on a state visit.
Ties worsened further when Sunni-ruled Saudi Arabia executed a Shi'ite cleric in January 2016, angry Iranian protesters stormed the Saudi embassy in Tehran, and Riyadh severed diplomatic relations.
After losing market share to Russian Federation past year, Saudi Arabia has sought to boost oil sales to China, the world's second-largest oil market, by working mostly with China's top three state oil firms.