Solar radiation system equipment technology development and sales; Technical development, technical consulting, technology transfer, and technical services in the engineering and railway fields; Import and export of goods and technology; Sales and installation of intelligent equipment, rail transit vehicle testing equipment, control systems, and industrial automation equipment; Lighting fixture manufacturing; Lighting fixture sales; Broadcasting, film, and television equipment sales; Electronic special equipment manufacturing; Electronic special equipment sales; Electronic component manufacturing; Computer software and hardware and auxiliary equipment wholesale. Construction engineering design and construction (must obtain qualification certificate from the construction administrative department before operation); Engineering supervision, engineering bidding agency (must obtain qualification certificate from the construction administrative department before operation).