TAIPEI, Taiwan (AP) _ Taiwan's Defense Ministry announced Sunday the reorganization of its intelligence operation following the conviction of three senior officers in connection with the murder in California last year of a Chinese-American writer.

The ministry said in a terse statement it was merging the intelligence bureau and the special military intelligence office ''to reestablish the normal function of the military intelligence structure.''

It said the new bureau, effective Monday, would be the ''intelligence arm'' of Chief of the General Staff Gen. Hau Pei-tsun and would be directed by Lt. Gen. Lu Kuang-i.

The statement said the ''overall reorganization'' was proposed by Gen. Hau and approved by Taiwan President Chiang Ching-kuo.

The organizational shakeup was considered likely after the conviction of its former director, Vice Adm. Wong Hsi-ling, 58, and two of his aides in the shooting of Henry Liu in the garage of home in Daly City, Calif., on Oct. 15.

Liu's writing was critical of the Nationalist Chinese government on Taiwan. A military court sentenced Wong to life imprisonment in April. His deputy, Maj. Gen. Hu Yi-min, 58, and a deputy section chief, Col. Chen Hu-men, 42, were sentenced to 21/2 years imprisonment each as accessories.

A military court of review upheld the sentences last month.

Gen. Wong Chin-shu, head of the National Security Bureau, took over as director of the military intelligence bureau after Adm. Wong was dismissed from his post in January.