Blacks constitute nearly 80 percent of full-time District government employes, but their median annual income is $7,523 less than that of whites, according to a report released yesterday by the D.C. Office of Human Rights.

"We view the report as a working document that gives District government officials the necessary data for affirmative action planning," Maudine Cooper, Human Rights director, said at a news conference.

The report was based on a survey of the city's 33,459 full-time employes who work in 56 agencies.

Of these, 79.4 percent of the employes are blacks with a median annual income of $19,024 compared with $26,547 for whites.

There is a disparity between the salaries because "many whites are at the senior level because of longevity on the job," said Dwight Cropp, director of the Office of Inter-Governmental Relations.

The staffing patterns report was based on information available as of June 30, 1984, and is the first such report issued by the Office of Human Rights since 1978.

Cooper said a more comprehensive report on the District government work force would be completed by Dec. 30.

The data from the reports also is expected to help the city if a proposal passes the City Council to study pay equity. Male employes of the District government are paid an average of $6,000 to $10,000 more a year than female employes, labor officials have said in City Council hearings.

On July 8, the council is expected to take an initial vote on a bill introduced nearly a year ago by council member Charlene Drew Jarvis (D-Ward 4) calling for the city to hire a consultant to determine how the city can promote pay equity.

According to the study released yesterday, women constituted 15,776 or 47.1 percent of all District government employes reported, and account for 30.6 percent of all employes earning $33,000 and more.

"This is the beginning of our effort to find out where blacks and women are," said Cooper.

"District government agencies are in the process of submitting to the OHR for review and approval affirmative action plans that address the underutilization of racial and ethnic groups and women," she continued.

"For the first time, agencies are submitting five-year plans . . . , " she said. "The position of women in this government needs to be examined, the position of Hispanics . . . Asians, as well as blacks."