Said invention provides a tent modular structure. It includes function and connecting passage tent whose outside top fabric are tight couple, tent intracavity interconnected, said interface channel tent is slimline type tent with opening at two ends, opening connected with other connecting passage tent, its side wall having at least one opening interconnecting with function tent, plurality of module tents consists of open country hospital system. Said invention provided modular structure has simple structure strong rain proof and wind resistance ability, capable of fast assembling disassembly open country hospital system, with good sealing disinfection condition, integrated with water, electricity, gasses, refrigeration and heating, information etc function, fitting use in field conditions.