This paper proposed a force and shiftlength detection method for a certain type fighter airplane control stick. Aimed at the airplane control stick force and shiftlength LVDT signals, a hardware who capture these signals was founded via signal conditioning circuit and PCI data collecting card based on virtual instrument technology；a software who analyze the collected signal data was founded based on VC++ 2010，it can display the dynamic data range of stick force and stick shiftlength via realtime curves；linearity of signal conditioning circuit was improved via Least Square Curve Fitting，and then detection precision of system was improved too. Theoretical analysis and experiment results show that the proposed method is effective for stick force and shiftlength detection.