​After the country reunited Tan Phong commune was under Duc Tu district, Bien Hoa province and the Republic of South Vietnam was disbanded to form Tan Phong commune, Bien Hoa city, Dong Nai province. On January 17, 1984 Ministers’ Council issued Decision No. 12 disbanding Tan Phong commune to form Tan Phong ward. On August 29, 1994 the government released Decision No. 109 on adjusting borderlines of some communes and wards of Bien Hoa city. Parts of Tan Phong and Tan Tien wards, Bien Hoa city were taken to form Trang Dai ward. Since September 1994 Trang Dai ward was officially established and started operating. Since the early days with a lack of facilities the leadership of the political system was unfamiliar and limited, people faced much of difficulties in life. But with solidarity and the myriad efforts of the Party Committee and people Trang Dai infrastructures have been breakthrough changes, people’s living conditions have gradually been improved and local political system has increasingly been reinforced to meet the requirements of leadership and administration during the integration period. Maintaining political security and social order and safety is a base for the Party Committee and people of Trang Dai ward to go ahead on the road of socioeconomic construction and development.

Trang Dai is one of 30 communes and wards of Bien Hoa city. It has total natural land of 1,446.1 hectares. Terrains of Trang Dai are shaped like a triangle stretching from east to west, with rough ground surface with small hills, tending to lower from north to south and east to west. The ward is east of Bien Hoa, bordering with communes of Vinh Cuu district. The border is defined as follows:

In the east, bordering with Tan Hoa and Tan Bien wards (Bien Hoa city) and Thien Tan commune (Vinh Cuu district);

In the west, bordering Tan Phong ward;

In the south, bordering Tan Hiep and Ho Nai wards;

In the west, bordering Thien Tan commune, Vinh Cuu district;

As of April 2019 Trang Dai’s total households are 23,645, with 110,766 people. The ward’s soil is sand-mixed oil evenly distributed across the quarters, suitable for short-term industrial trees and fruit trees. Geological texture is quite solid, suitable for multistory buildings, residential and urban area development. However, due to high slope many areas often face erosion and flood during rainy season, caused by a large amount of water flowing from the heights, especially streams and low-lying regions.

Trang Dai ward is located in subequatorial monsoon tropical zones, with high temperatures all year round, high rainfall, sharply differentiated with seasons. During the year there are two major seasons namely rainy and dry ones, favorable to agricultural production and fruit tree planting. Rainy season starts in May to the end of November and dry season begins in December till the end of April. Water flow during rainy season makes up 85 percent annually, with rainfall at 1,600 to 1,800 mm per year.

Trang Dai’s average temperature is at 28⁰ C and its median humidity is at 79 percent per year. The number of average sunshine hours is relatively large; even in rainy season the figure sometimes reaches 5.4 hours a day meanwhile in dry season 8 hours a day. The ward is less likely to be hit by storm winds but there are shearwinds and whirlwinds occurring at the beginning and the end of rainy season.

In terms of religion nationwide there are 12 State-recognized religions, of which four major regions are practiced in the ward, including Buddhism, Catholicism, Protestantism and Caodaism. Among the religions, Catholic followers make up the majority.  Recognized religious institutions include Thai An Parish, Ba Ngu Hanh Temple and Buu Minh Monastery. According to statistics, the total number of religious followers is 7,895 people in 1,726 families, in which Buddhism consists of 554 households with 1,362 followers; Catholicism 1,156 with 6,500 followers; Protestantism 12 households with 31 followers; Caodaism four with seven followers. People in the ward are free to follow any beliefs in accordance with legal regulations. That religious institutions have been recognized enables people to practice reliefs, proactively contributing to Cultured Families and Quarters construction.

In regards with ethnicities, besides Vietnamese in Trang Dai there are also people of other ethnic groups who live and work, accounting for 0.3 percent of total population, including Chinese, Tay, Nung, Muong, Thai, Kho Me, Dao, etc.

In 2019 there are six public schools, including Trang Dai kindergarten, Trang Dai primary school, Ha Huy Giap primary school, Nguyen Thai Hoc primary school, Trang Dai secondary school, Hoang Sa secondary school. In addition, there are two private schools, including Dong Nai Technology University and Be Ngoan preschool and 41 private children groups. Most of the schools in the ward are well equipped, spacious, and eligible for teaching and learning, with rates of students passing the class and graduation exams are over 96 percent. To date Trang Dai has completed illiteracy elimination and primary-secondary-high school universalization in line with temporary of the province and regulations of the Ministry of Education and Training.

The ward has one health station. Since its construction, the station has always met all assigned goals in treatment and epidemic prevention, effectively completing the assigned tasks.

Trang Dai ward is near to two most beautiful life-line roads in Bien Hoa city, namely Nguyen Ai Quoc street (01 km in length) and Dong Khoi street (about 06 km in length), creating favorable conditions for socioeconomic development in future. In addition to them, the ward has a system of main routes such as Bui Trong Nghia, Nguyen Khuyen, Nguyen Thai Hoc, Than Nhan Trung, and Nguyen Phuc Chu. Furthermore, there are inter-group and inter-quarter roads. Alleys and groups have had car-fit roads. Every year road system is reinforced and upgraded by the State and people, making them spacious, clean and beautiful, enabling people’s activities in production and business.

These days, along with urbanization of the city clean tap water has been connected to blocks and quarters, meeting safety standards for locals’ use.

In terms of economics, Trang Dai used to be an agricultural production ward, growing different type of annuals such as cassava, peanut and green vegetable, and perennials such as cashew and cajuput. In addition, there are some home-scale livestock raising households. Traditional craft industries include fine-art ceramics, wood-things, chopsticks, knit rattan and bamboo exports while other establishments produce bags and footwear on smaller scale. As of earlier 2019 there were 2,330 business households and 1,329 limited liability and private companies and 619 lodging-house providers.  Production values of industry and small-handicraft industries have increased over years.