Blacks and women continue to join the federal work force in increasing numbers. And pay differences within the bureaucracy are greater between the sexes than between racial or ethnic groups.

The number of white males employed by Uncle Sam is slowly, but steadily, declining in nearly every federal agency. So is the average pay and grade level of white men.

But despite upward mobility programs and an annual net increase of between 8,000 and 10,000 minority group workers in the federal establishment, white men continue to dominate middle and top-paying jobs.

White males earn an average of almost $6,000 a year more than women, and more seniority, get slightly more Black men, because of higher grades than $2,000 a year on average than either white or black women who are concentrated in clerical and nonprofessional jobs and grades.

Only Oriental-American women, who make up a very small percentage of the federal work force, make more than black males. And Oriental-American male employes have the highest pay and grade average of any group of workers in government. Federal officials say this is because of "significantly higher, and better educational levels" among both male and female Oriental-American workers in government.

A new Civil Service Commission study (based on May 1977 data) shows that the number of women and minorities in government is at an all-time high, exceeding even the peak years of World War II when women moved into the federal and private job market to replace men called into military service.As of May 1977, 30 of every 100 federal employes were women, and 40 percent (or 745, 436 jobs) of the total minority work force is made up of women.

Minorities in government (including women) made up 21.2 percent of the 2.4 million total federal jobs. Forty-four percent of the 386,478 blacks in government, and 23 percent of all Spanish-surnamed employes (a total of 82,865) were women. The total number of American Indians in government was 24,139 with 44 percent of those jobs held by women. Oriental-Americans, according to the 1977 CSC figures, were employed in 24,761 federal jobs, with 31 percent held by women.

Government agencies now are making new head counts of their work force to determine how many women and minorities are employed. That data, which won't be ready for another few months, is expected to show even more women and minorities in government.

Civil Service Reform: Everybody agrees that President Carter's proposal to streamline the bureaucracy is going somewhere. The question is when will it become law and what will it look when it arrives?

Although Democrats outnumber Republicans on the House Post Office-Civil Service Committee, 17 to 8, Carter is counting on GOP support to get the bill reported out of the committee. Popular, brainy Rep. Morris K. Udall (D-Ariz.) has been picked to ramrod the measure while Chairman Robert N.C. Nix (D-Pa.) is involved in a tough Philadelphia Democratic primary (May 16) fight.

The reason the Republicans have been summoned: Two weeks ago, 12 Democratic members of the committee met to talk about reform. On the question of who favored the measure, the vote was 12 to 0. But when asked who favored action this YEAR, the vote was split, 6 to 6.

When word of the vote reached the White House, President Carter decided to call in the Republicans for help. And that is why they will play a major role in the bill-writing, which is officially scheduled to begin May 22.

Legal Secretaries: Public Defender Service in D.C. has two Grade 6 vacancies. Call Rachel Cox at 628-1200.

Employe Relations Specialist: Government Printing Office is taking applications for the Grade 12/13 job, and also needs Grade 5 through 9 industrial engineers. Call 275-2802 for details.

Benefit Payment Clerks: Civil Service Commission has openings at the Grade 4 level. Applicants must have two years of college or related experience. Send Form 171 applications to Ms. Harrington, Room 4312, 1900 E St. NW by Monday.