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We have established a system for detecting weak heat ux due to phase transitions by a combination of DTA by using the mK-stabilized cell" previously developed and treatment by both the moving average and the box car integrator by using a personal computer. By the system, the existence of a phase transition in CsPbCl3 was con rmed, having been observed by our X-ray di raction study, and the phase transition series was reported to be predominant, having a heterostructure. Weak heat ux was also observed in CsPbBr3, having been con rmed to be phase transitions by X-ray di raction. The phase transition temperatures in CsPbX3(X = Cl, Br) recognized by the heat ux measurements are in excellent agreement with the results of NQR measurements.