Experiments of~3He release from LaNi_(4.25)Al_(0.75)materials which aged for 3 years are made byusing ultravacuum metal system and metal leak which is designed by the authors.~3He analysisare performed by a set of Gastrace quadrupole mass spectrometer(QMS).Result show that there are 6 releasing peaks in LaNi_(4.25)Al_(0.75)aged materials by thermal desorption experiments at RT-1 273 K.Each peaks suggesting trapping of 3He analysis of performed from a set of Gastrace quadrupole mass spectrometer (QMS ) .Result show that there are 6 releasing peaks in LaNi_ (4.25) Al_ (0.75) aged materials by thermal desorption experiments at RT-1 273 K.Each peaks suggesting trapping of