This is the first time PNG is taking part after winning 10 gold medals at the Newcastle Special Olympics in Australia to qualify for the Games.
PNG is represented by seven athletes - four women and three men, who are taking part in athletics and shot put.
Head of Delegation Takale Tuna told our reporter Paul Taumik in Oxnard city, the team is doing well.
"Thompson Ninkama, our athlete from Goroka, he did 3000m.
"He did very, very well coming 4th and actually breaking his own record.
"He sliced his time from 12 minutes to 10-minutes slicing 2-minutes off his personal best so he's into the finals for Wednesday.
"Also our Gulf competitor, Mirisa Mana, he competed in the shot-put also he did his personal best qualified into the finals tomorrow as well.
"So, yeh good start.
"Tomorrow they'll be taking part in the afternoon.
"Thompson Ninkama is gonna be doing the 1500m and then in the afternoon our boys will be running the 100m and our girls will be into the finals in the 100-meters as well," Mr. Tuna said
More than 6-thousand athletes from 165 countries are competing in 25 sports competition in the bi-ennual games.