In a pre-recorded video message, Marape said Papua New Guinea had participated in the first two expos since 2018, which proved to be a very rewarding experience.
"It gives me great pleasure and honour to represent the government and people of PNG to make the remarks at the opening ceremony of the 3rd China International Import Expo," he said.
"I want to thank President Xi Jinping and the government of China for the invitation, and extend my warm congratulations on the opening of the expo.
"The expo is a gateway for PNG to be connected to China and Asia, which will benefit our companies and people.
"This year's event will further open the huge Chinese market for high-quality products from PNG and other countries, giving much needed energy to global trade and economic growth at this difficult time."
Marape went on to says the pandemic could be defeated through solidarity and co-operation which was also the way towards global economic recovery.
"It is therefore timely and commendable to hold this great expo at this critical time. As the world's second-largest economy, China's economic recovery is significant for the rest of the world. We are encouraged by the positive growth figures in China, which International Monetary Fund forecasts will be the only major economy to register positive growth this year.
"This expo, as a major international procurement platform under the framework of the Belt and Road Initiative, will undoubtedly open up new horizons for other countries to share the opportunities generated by China's recovery and growth.
"The Belt and Road Initiative has inspired all of us, particularly young developing countries like PNG with a population of about nine million, most of whom reside in the rural areas.
"I believe that through joining the Belt and Road Initiative, PNG will be able to unlock our economic potential, reach our marginalised population, build connectivity through infrastructure development and bring services and prosperity closer to our people.
"We also thank China for timely sharing of its experience on combating Covid-19 with PNG and other Pacific Island countries.
"After Covid-19 cases broke out in PNG, the Chinese government provided cash assistance and sent tonnes of personal protection equipment as well as ventilators and other equipment. I know similar stories happened around the world," Marape said, congratulating President Xi Jinping and his government for successfully containing the pandemic in China.