Objective: To observe the curative effect of low temperature thermoplastic plate in children with forearm fracture middle-late healing. Methods: A total of 80 patients with ulna and radial fracture were recruited from pediatric orthopedics of Wuxi Children’s Hospital from January 2016 to May 2017. The patients were randomly divided into a low-temperature thermoplastic group and a traditional gypsum group, with 40 cases in each group. All groups underwent manipulative reduction and Gypsum fixation. After 3 weeks, the gypsum of the low temperature plate group was removed and replaced with a low temperature thermoplastic plate. External fixations were all removed in the two groups after 6 weeks and evaluate the function of the forearm. Results: According to the Anderson scoring system, the score of low-temperature plate group was that the excellent had 37 cases (92.5%), the good 3 cases (7.5%), and the average and the poor none. Traditional gypsum score was that the excellent had 30 cases (75%), the good 8 cases (20%), the average 2 cases (5%), and the poor 0 case (0%). There is a significant difference between the two groups (P<0.05). Conclusion: The low temperature thermoplastic plate has obvious advantages over traditional gypsum in the middle and late stage of fracture healing of forearm, and it is worth popularizing and applying.