St. Aloysius Technical School, established by the Spanish Jesuit missionaries, was originally situated in the industrial city of Wuhu, Anhwei province, Mainland China. The purpose of establishing the school was to answer the need to raise the standard of industrial and technical skill of the local people. As a consequence, raising the standard of living of the people in the area and contributing to the overall economic development of the whole country. 

These Jesuits, expelled from China by the communist, came to Taiwan to continue their missionary work among the Chinese whom they loved. Realizing that there was a great need for industrial and technical skill, they re-established St.Aloysius in the small agricultural town of Hsinpu, Hsinchu County. St. Aloysius started in Taiwan as an extension school where local people learned new techniques and improved their skills on Saturday evenings from 6:30 to 10:30.

As the number of students increased, the old classrooms in the compound of the Catholic Church became inadequate. A search for a new and bigger location was launched. In 1956, a piece of land in Sze Tzuo Lih was bought. Construction of the classrooms began immediately. And in November of 1956 St.Aloysius moved in the present site. By now, St. Aloysius was approved by the government as an Industrial and Professional Extension High School. The new St. Aloysius opened its doors to 80 students.

Some important dates in the school's development:

• 1965: St.Aloysius became a 5-year technical high school receiving regular day school students.
• 1968: St.Aloysius became a 3-year technical senior high school.
• 1969, August: constructions of the 3 story Mechanical shop, 2 story Electrical shop and 3 story teachers' apartment.
• 1975: construction of the Electronics Automatic Control shop and acquisition of related equipment and teaching materials.
• 1979, December 8: ground breaking for the construction of the auditorium.
• 1982, June 21: inauguration of the new auditorium.
• 1982, September: Control Department began accepting girl students.
• 1984, Apri1 24: ground breaking for a 4 story administrative building.
• 1985, June 16: inauguration of the new administrative building.
• 1990: In response to the need of the present time, the Department of Information was inaugurated.
• 1996, June 10: renovation of the athletic field.
• 1997, March 28:inauguration of the athletic field with a new running track paved with polyurethane.
• 1999: St. Aloysius enters a new educational system. The Department of Education mandated that by 1999, every high school in Taiwan must conform to the system of crediting students by units earned. This year the Control Department has been changed to Electronics Department and in the Mechanical Department, a new Department of Electro Mechanical has been created to fill the need for inter-disciplinary cooperations and to answer the special need for this kind of skill needed by the industry.

At present, the school's student population is composed of 1,742 day school students and 445 night school students .The school has 5 departments: Electrical, Electronics, Information, Mechanical and Electro Mechanical.