SEATTLE (AP) _ Two candidates with opposing positions on school busing will face off in November's mayoral election after finishing atop a 13-candidate field in the primary race.

City Attorney Attorney Doug Jewett, a Republican and co-sponsor of an anti- busing initiative, finished first in Tuesday's primary. City Council member Norm Rice, a Democrat and leading opponent of the measure, finished second. It is Rice's second bid to become Seattle's first black mayor.

With a voter turnout exceeding 31 percent and nearly all votes counted, Jewett had 23,299 votes or 24 percent and Rice, 20,763 votes or 21.4 percent.

Former King County Executive Randy Revelle was next with 14,880 votes or 15.4 percent, followed by City Council members Jim Street, 14,473 or 14.9 percent, and Dolores Sibonga, who had hoped to become Seattle's first Asian- American mayor, 11,422 votes or 11.8 percent.

David Stern, advertising executive and creator of the ''Happy Face,'' had 5,311 votes for 5.5 percent.

Mayor Charles Royer, a liberal Democrat and former president of the National League of Cities, is stepping down after an unprecedented 12 years in office. He'll become head of the Institute of Political Studies at Harvard University's Kennedy School of Government.

Rice was rated the pre-election favorite because of the name familiarity he built in a losing 1984 mayoral race and congressional bid last fall.

Jewett's campaign focused on his backing of Initiative 32, an attempt to end mandatory busing in the city. The measure, which is being challenged in court, is scheduled to appear on the city ballot Nov. 7.

All the other major candidates opposed the initiative and supported the new ''controlled choice'' program, adopted this year to reduce the reliance on mandatory busing that has angered both white and minority parents who want their children in neighborhood schools.

Rice, 46, who said the school initiative was the main reason he ran, told cheering supporters, ''This election is one of clear choice.'' He accused Jewett and other initiative backers of being racially divisive.

Jewett, 43, dismissed the criticism.

''The school issue is not a racial issue,'' he said. ''It's a matter of choice and parents being able to send their children to quality neighborhood schools.''